You can find a few good sets of barrels on EBay if you watch for them. As donor barrels your able to select anything with length needed and not worn out. I'd look for a good brown set which has decent bores and not dented up. I'd stay away from British barrels which start out thinner than American barrels.

I found an extra set of Demarcus barrels for a Baker last year for less than $50.00. When I got them their serial number was within 100 of the gun I was adding them to as a second set of barrels. Not an exact fit as they came to me but within ten minutes they fit well and by half an hour they were a perfect fit. I got lucky on them. I have missed on a few others. You put your money down and take your chances. If they don't work out just relist them and move on.