Costco has launched a promotion allowing its U.S. Costco card members to receive $100 or $50 mail-in rebates when they pre-order an iPhone 6s or 6s Plus. The mail-in rebate amount is different for each carrier.
T-Mobile customers get a $100 mail-in rebate when they pre-order any iPhone 6s or 6s Plus in any color and / or storage option. Verizon and Sprint customers, however, only receive a $50 mail-in rebate on either a 16 GB gold iPhone 6s Plus, a 16 GB Space Gray iPhone 6s or a 64 GB Space Gray iPhone 6s. AT&T customers, unfortunately, are not eligible for any mail-in rebates.
While it's not rare for iPhones to get mail-in rebate forms or discounts, it is rare for a promotional price to be offered on an iPhone during its pre-order period. Costco card members must pre-order their iPhone 6s or 6s Plus online between September 12 and September 24 to be eligible for the mail-in rebate.
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For T-Mobile customers it's a $100 mail in rebate for a Costco cash card plus free Accessory Bonus Pack including a dock and car charger and free $25 Costco Cash Card according to the site.
So $125 in Costco Cash in total plus some other goodies.
Also, FWIW, T-Mobile offers a free WiFi AC router that is excellent and works with wifi calling and SMS very well - just in case you are worried about coverage issues.