Hey OOT, how do you fly for cheap?

[diddyeinstein]

I'm going to visit my girl in Portland, OR around Thanksgiving and have been trying to find decently priced airfare. I understand that tickets are going to be more expensive around the holidays so I'm planning on flying in the Monday before and leaving the Monday after to try to get around this.

Basically, I suck at the interwebs and was wondering if you could refer me to any sites that ya'll use for booking cheap(er) flights. So far ~$300 seems like the cheapest, but I think I should be able to find something better.