Hey guys/gals, I have a question about the oem keyless entry system. I lost my keyless entry unit from off my keys

in my house and they cant find them anywhere. But anyway I was searching on ebay and found some units for the rsx, mdx, and what not for like 20 bucks. And plus they look ten times sweeter than the one I had before. Now on most of the auctions they say they can be programed(at an acura dealership) to work with all acura's. Any truth to that?? I called my local acura dealership today but they were closed.
Thanks guys