Walmart offers the Wen Multifunction Oscillating Tool for $29.47. Opt for in-store pickup to dodge the $5.99 shipping fee and cut the price to $20.34. (Amazon charges around a buck more.) That's the lowest price we could find by $9. It features a 2 amp motor and 10,000 to 20,000 oscillations. Included are a carrying case, scraper blade, sanding pad, sanding papers, and saw blade.

Update: The price has dropped to $19.93 with in-store pickup. Amazon is matching this price.