Inexpensive will probably end up meaning an A&B or ER Shaw barrel blank. Not sure you will have enough meat to just re-chamber to the new wildcat. That would depend on some factors that others here will know more about than I.
Good Luck
Gary
P.S. I do not try to promote either of the above barrel choices, but you did say Cheap Start, and those are cheap. Some times you get a good barrel too. I have heard (_Hear-Say_) that the new ER Shaw barrels actually Tend Towards Decent (not fantastic) shooters.