Unless the slide has worn out the carb body, reconditioning a carb isn't a big thing. A proper clean, a Viton-tipped float needle, new gaskets and there you go.
OTOH, if the body is worn and a new slide will have excessive play, the carb body will have to be re-sleeved. I've never had that done, but I doubt it will be much cheaper than a new one alltogether. Others might know more/better.
Cheers, Markus