We have a Balsam Hill "Vermont White Spruce" 6.5 feet unlit tree, which we bought on sale after Christmas 2013 and were very happy with when we put it up last year. We just got tired of all the critters that come with real trees and the mess that's left behind every year. We also didn't want a pre-lit tree because we prefer picking out our own style of lights and have read stories about pre-lit lights burning out.
I believe Balsam Hill had an "up to 70% off" sale after Christmas, and just from looking through my emails ran an "up to 50% off" sale on Black Friday last year. The sales don't really mean anything because I don't think Balsam Hill ever sells their trees at "full price." Just for reference, it looks like Balsam Hill is running an "up to 40% off" sale right now and our tree is priced at $399. We bought our tree after Christmas for $329+tax with free shipping. (I don't know if Balsam Hill charges tax outside of California, where we live and they are headquartered). If you can wait until after Christmas and want to go with Balsam Hill, I'm pretty sure there will still be plenty of trees in stock because that's their core business.
The nice thing about Balsam Hill's many varieties of trees -- particularly their signature trees -- is they have a high percentage of "true needle" foliage, which are twigs and needles formed from injection-molded PE plastic that look very real. There still are some fake looking PVC foliage, but those are only on the inside of the tree that you barely see and used to make the tree look full. The tree does need to be "fluffed" during assembly every year to shape it and make it look full, and the process is kind of a pain, but the results are quite nice. My only complaint about our tree is that the twigs aren't really separately painted brown and the needles are a bit too dark green throughout the whole holiday season. This was a bit of an impulse buy, but if we had more time I probably would've ordered Balsam Hill's sample box to see all the different needles. But like someone above said, once we decorated it, we hardly noticed.
We also considered Frontgate, whose trees look very nice and realistic online, but couldn't find a tree that suited us (and I believe all their trees are pre-lit).