How expensive is it to repair a bagpipe?

Have you contacted the pipe maker? Most will stand by their product if you haven't abused them in any way, or at least do a repair. I had a hairline crack start in my b drone. I was able to repair it by filling the crack with 'crazy glue' and using a piece of sheet rubber around the drone and securing it with a couple of hose clamps. I left the clamps on for a day and I haven't had the crack open up and it's been several years now. (ymmv) But, with a relative new set, I'd contact the maker.