At Best Buy, purchase any cell phone with a 2-year contract and receive a $50 Best Buy Gift Card for free. (The gift card must be reserved by February 9 and the purchase must occur between February 10 and December 31.) That's the best general gift card offer we've seen for cell phones at Best Buy. Sales tax is added where applicable. Eligible mobile phone carriers include Verizon, AT&T, Sprint and T-Mobile.