Walmart offers the Viair Portable Compressor Kit for $47.04. Choose in-store pickup to cut it to $46.57. (Amazon charges the same.) That's $5 under our mention from two weeks ago and the lowest price we've seen. (It's the best deal now by $14.) It works for tires up to 33" and includes an LED work light, a 120 PSI gauge, and dual battery clamps.

Update: It's now sold out at Walmart; however, Amazon still offers it for $46.57 with free shipping.