Benny,
I've never bought off Gunbroker, got mine at gunshops, gunshows or trades. Prices seem to run from about 600 to 900 depending on condition, caliber, wood. If your donor rifle was a .223 you wouldn't have to change extractor. .22 Hornet and .218 Bee would probably work also. Most barrels are a little over $300. I got my last barrel from The Barrel Man. He has a deal with Shilen and sells them for about $230 for stainless match.
http://thebarrelman.com/
Some gunsmiths will thread and chamber for about $200. Mark Penrod charges about $400 but he is really good with Rugers.
If you've looked at my posts, you seen how I do the scope bases.
This is the first visitor message I've had, I hope it gets back to you.
Dave