I collect Astros cards (and Colt .45s, too). I put together team sets for each year and always end up with hundreds of extras. If you want to swap send me a want-list (e-mail: firstname.lastname@example.org) and I will see what I have. I'm also interested in buying what I don't have. I can send a want-list to you and will try from time to time to list them here somewhere on the blog.
I mostly have common cards to send, so do not send me a list of inserts that you need. However, I do have a large supply of cards from 1975 to the present that can be used to fill some gaps in your collection.