I had a problem with my mouse. The slippery plastic bits on the bottom weren’t glued on well and came off, which then gave more friction when moving on the desk. After asking advice on a mailing list the best suggestion was Teflon sticky tape. I bought a few meters of such tape (a lifetime supply for mouse repair) and used an 8cm strip on each side of the bottom of my mouse which made it slippery enough.
Ebay seems like a good place to buy that, most of the offers are well below $20 for a reel of tape including postage. One thing to note is that they also sell non-adhesive teflon tape. I made the mistake of investigating the capabilities of teflon tape then buying the cheapest one on offer which turned out to be “plumber’s tape” which doesn’t have adhesive, fortunately it was well below $10. I now have a lifetime supply of plumber’s tape if I can ever find a use for it.