You can get some great deals after Christmas, but the good trees are usually sold out by then as well. One of the best fake tree producers is in my hometown Holiday Tree and Trim. The trees are made in the USA and look nice! We still haven't broke down and bought one for the house, but we did buy a nice one for the Church last year. The trees are expensive, but I've seen them in person and they are worth the money.
You can shop online at
http://www.holidaytree.com/
ps- the page is running S-L-O-W today