Find a co-op. Minneapolis must have several? At the co-op I volunteer at, we will sell frames cheap, really cheap.

I have also found deals at various co-ops on bikes from their "Dog pile". Bikes that have not been worked on yet, and that can have some "issues". Many co-ops have quite a backup on projects to work on, so it can be a win-win to buy something they haven't worked on yet!

Even if the Minneapolis co-ops are not to your liking, I have learned to stop/shop at co-ops in other towns as well. Road trips/vacations become bicycle shopping trips. Again, do them a favor if possible and pick up something they haven't put time and precious consumables into yet. And donate parts you don't need from your own stash!