Costco via its Wireless Center is offering a notable deal on iPhone today. If you buy or upgrade to iPhone 6s/Plus on T-Mobile you are eligible for a free $400 Costco Gift Card via mail-in rebate. It is valid on new and existing lines.
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Now pricing on the actual device and stock availability will be slightly different by location, so your mileage will certainly vary here. But you can use this handy warehouse locator to find your nearest location. Device payment activation is required and the offer is valid until July 27th (tomorrow).
More details here and down below. Remember you can still grab iPhone 5s 16GB pre-paid for just $50 shipped (Refurb, Orig. $649) right now at Walmart.