Home Depot offers the Stanley FatMax 12" Compass Saw, model no. 17-205, for $9.94. (Walmart charges the same via pickup. Amazon also matches this price, with free shipping for Prime members.) Opt for in-store pickup to avoid the $5.99 shipping charge. That's the lowest price we could find by $4. It features heat-treated, triple-ground teeth.

Update: It's now sold out at Home Depot and Walmart; however, Amazon still offers it for $9.94 with free shipping for Prime members.