Walmart offers the KitchenAid Ice Cream Maker Attachment for $46.99 with free shipping. (Amazon has it for the same price.) That's the best deal we could find by $13, although we saw it for $6 less on Cyber Monday. It makes two quarts of ice cream, gelato, or sorbet in 20 to 30 minutes. It fits select KitchenAid 5- and 6-quart stand mixers.

Update: It's now sold out at Walmart; however, Amazon still offers it for $46.99 with free shipping for Prime members.