Newegg.com has GIGABYTE GA-Z77X-D3H LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard for $99.99 after $15.00 rebate card. Shipping is free. This is now the lowest price I could find for this motherboard, at least 40 bucks lower than the next available best price. So I can say this is a very decent deal.
The GIGABYTE GA-Z77X-D3H LGA 1155 gains some very good reviews, so if you want to improve your PC with quality motherboard, I believe this is an ideal one you should consider.
I don't know how long will this deal last, so hurry up if you want it.