Drobo S 5-Bay USB 3.0 / FireWire 800 / eSATA Enclosure for $508 + free shipping

B&H Photo-Video offers the Drobo S 5-Bay USB 3.0 / FireWire 800 / eSATA Storage Array Enclosure, model no. DRDR4A21, for $508 with free shipping. Outside the mention below, that’s the lowest total price we could find by $62. This enclosure can hold up to five serial ATA hard drives for up to 20TB total. It features BeyondRAID technology, which chooses the correct protection algorithm based on data availability needs and allows switching from single to dual disk redundancy with a single click.

A close price: Adorama offers it for $509.95 with free shipping.

ProStor 750GB eSATA / FireWire 800 / USB Portable HDD for $134 + $8 s&h

Trans Intl. offers the ProStor 750GB Portable eSATA / FireWire 800 / USB 2.0 External Hard Drive, model no. 725, for $134 plus $8 for shipping ($0.19/GB). That’s $4 under our mention from four weeks ago and the lowest total price we could find for a portable quad-interface hard drive of this capacity and speed. This 750GB 7200 rpm external hard drive features an aluminum casing, 16MB cache, eSATA and USB combo port, FireWire 800 port, and FireWire 400 port.

Refurb Apple AirPort Extreme 802.11n Wireless Station for $100 + free shipping

Buy.com offers the refurbished 5th-generation (current generation) Apple AirPort Extreme 802.11n Wireless Gigabit Base Station, model no. MD031LL/A, for $99.99 with free shipping. That’s tied with our March mention of a refurb and it’s the lowest total price we could find by $10. (It’s also $63 less than the best price we could find for a new unit.) This 802.11n wireless 4-port Gigabit router has a USB port for sharing a printer or hard drive and works on both 802.11g and 802.11n frequencies simultaneously.

A 1-year warranty applies, although it is not clear who backs it.

Refurbished Vizio 22″ 1080p LED LCD HDTV for $146 + free shipping

At MacMall, search for “E220VA REF” to find the refurbished Vizio 22″ 1080p LED-Backlit Widescreen LCD HD Television, model no. E220VA, for $145.99 with free shipping. That’s $44 under last winter’s mention of a refurb and the lowest total price we could find for a refurb today by $14. (For further comparison, it’s also $62 less than the best price we could find for a new model.) It features a native resolution of 1920×1080 (1080p), edge-lit LED backlight, 20,000:1 dynamic contrast ratio, 250 cd/m² brightness, two HDMI inputs, and VGA and other video inputs.

A 90-warranty applies, although it’s unclear who supports it.

Samsung 23″ 1080p LED-Backlit LCD Display for $140 + $5 s&h

Buy.com offers the Samsung SyncMaster 23″ 1080p LED-Backlit Widescreen LCD Monitor, model no. S23A300B, for $139.99 plus $5.49 for shipping. (You’ll need to proceed through checkout to see this price.) That’s $17 under yesterday’s mention and the lowest total price we’ve seen. (It’s a current price low by $27.) Features include a 1920×1080 (1080p) native resolution, LED backlight, 3,000:1 dynamic contrast ratio, 250 cd/m² brightness, 5ms response time, and both DVI and VGA inputs.

Shure Vocal Microphone for $29 + free shipping

Guitar Center offers the Shure Vocal Microphone, model no. SM48-LC, for $29 with free shipping. That’s a buck under our mention from February and the lowest total price we could find now by $20. It features a cardioid pickup, shock-mounted cartridge, built-in “pop” filter (which reduces explosive breath sounds and wind noise), and more.

Canon PowerShot ELPH 510 HS 12MP 12x Camera Kit for $199 + free shipping

Adorama offers the Canon PowerShot ELPH 510 HS 12.1-Megapixel Digital Camera Bundle in Silver, model no. 5266B001, with the Dane Elec 1GB Secure Digital Memory Card, model no. 1244V715, Canon PSC-2050 Deluxe Fitted Leather Case in Gray, model no. 4335B001, Canon 3×3″ Pocket Size Inkjet Photo Album with Software, model no. 0041B009, and Canon X Mark I Premium Desktop Calculator in Black, model no. 3982B005, for $198.98 with free shipping. That’s tied with last month’s mention of the camera itself and $54 under the lowest total price we could find for these items elsewhere. It features a 3.2″ touchscreen LCD, 12x optical zoom, 1080p video recording, optical image stabilization, SDHC card slot, mini HDMI and USB connectivity, and more.

Logitech Clip-On Speaker for Apple iPad for $20 + $2 s&h

TigerDirect offers the Logitech Clip-On Speaker for Apple iPad, model no. 984-000193, for $19.97 plus $2.29 for shipping. Outside of the price below, that’s the lowest total price we could find by $3. This speaker features a rubberized clip that attaches securely to your Apple iPad or other tablet with a 3.5mm audio output.

A close price: Logitech sells a “dented box” version for $19.99 before coupon code “logi_tabs_52512″, $17.99 after. Shipping adds $6.21. Coupon expires today.

HP 2011x 20″ LED-Backlit Widescreen LCD Display for $76 + free shipping

HP Home & Home Office Store offers its HP 2011x 20″ LED-Backlit Widescreen LCD Monitor, model no. XP597AA#ABA, for $99.99. Coupon code “ACCS73419″ cuts it to $75.99. With free shipping, that’s $14 under our April mention and the lowest total price we could find by $44. Sales tax is added where applicable. Features include a 1600×900 native resolution, LED backlight, 1,000:1 native (3,000,000:1 dynamic) contrast ratio, 250 cd/m² brightness, 5ms response time, DVI-D and VGA inputs, and more.