At Yugster, get two eGriffin Moto TC Rally Cars for $29.97. (Add just one to your cart; the second one is free.) Coupon code "FreeYugBuck" cuts it to $28.97. With $5 for shipping, that's the lowest total price we could find for two by $46. Each car features a rechargeable 600 mAhr battery, USB charge cable, and control via an included app for iPhone or iPad.
Note: The countdown timer on the product page does not reflect an actual expiration time and resets daily.