The refurbished ones typically only have the rubber seals replaced. The batteries cannot be replaced, so I personally would make those a hard pass.
When I replace mine I go with the cheapest one that I can confirm uses the correct frequency (315 IIRC.) Some cheap generic ones need programmed to a certain frequency before install with a very expensive tool. You want to pay slightly more to avoid those as the tool will cost waaaaay more then just buying the correctly pre-programmed ones (typically ~$40-$50.)
And of course, make sure you get the correct length, stem size, etc. Best bet (as with all parts) is to find some on RockAuto, but copy and paste part numbers into Amazon or other places to check for lower prices/free shipping.
2007 Solstice GXP
#3 ASP, DET and NWOR SCCA
"It's a Kappa - not a classic"