At AT&T, sign up for a select AT&T U-verse Broadband / TV / phone package and receive up to $200 in AT&T Reward Cards for free. (Reward amounts start at $100 and a "U-family" U-verse TV package or greater is required to begin receiving rewards.) That's tied with our mention from last week as the best reward card offer we've seen from AT&T since July. Click here for complete details on reward requirements.
Note: The cheapest eligible plan that qualifies for a Reward Card appears to be the U-family TV service — which includes a $100 Reward Card — for around $29/month. It includes up to 130 TV channels and one DVR. (Plan prices vary by location.)