Buy.com offers the Kanguru 100 128GB 2.5″ Serial ATA 3Gb/s Internal Solid State Drive, model no. KSSD100-128GB, for $99.99 with free shipping. That’s $0.78/GB and the least expensive 128GB SSD we’ve seen. (It’s also a current price low by $42.) It features read speeds of up to 230MB/s and write speeds of up to 200MB/s.