Amazon offers the Gigabyte LGA 1150 Intel H81 Micro ATX Motherboard, model no. GA-H81M-H, for $33.99. This $10 mail-in rebate cuts it to $23.99. Plus, Prime members bag free shipping. (Non-members can spend $49 to qualify for free shipping; otherwise, shipping costs $8.90.) That's the lowest total price we could find by $22, outside of the deal below. It supports Intel Core i7 / i5 / i3 / Pentium / Celeron processors and up to 16GB RAM; it also features a PCI Express 2.0 x16 slot, two PCI Express x1 slots, and Gigabit Ethernet. Rebate expires May 31.

A close price: Newegg offers it for $23.99 plus $1.99 for shipping when you apply coupon code "EMCETGM55" and redeem this $10 mail-in rebate.