I ran across this site looking for webbing today for some DIY tree straps. They sell pre-sewn straps at what I thought were pretty reasonable prices for all of us "non-thread injector" types...
It might even be a place we could do a group buy from with some custom Hammock Forums logo-ing on in the future to support the site?
Here's the link to the sewn straps:
*BTW - I am in no way affiliated with this site, just a random find while perusing the interwebs. I've never ordered from them, and don't know about quality or customer service. The "about" page seems like it's a pretty legit mom-and-pop operation though. There's even a small blurb about hammocking in their blog.