Yep, that's pretty much what I found. And here's
a replacement for $31, including shipping:
http://www.amazon.com/Dewalt-1500AH-.../dp/B0023S8F9U

Any chance the rebuild is significantly better than the replacement?

Seems like the ones from www.primecell.com are.
NIMH -Maximum capacity packs: NiMh batteries are usually available in
two battery sizes. Small packs were 1.5 AH and large battery packs
were 2.2 AH to 2.6 AH We rebuild the small case with 2.1 AH and the
larger packs are improved to 3.3 AH. Either rebuild usually adds 50%
more run time.