I bought mine at Ebay from one of the merchants. I surfed until I found the best price / shipping combo. Nice mirrors, but truth be told, I'll never buy them again. I know they look cool, but you can't see out of them worth darn.
It's a more expensive option, but consider getting TJ or YJ mirrors. You can get TJ mirror relocation brackets that will fit directly on the CJ and use them to mount the mirrors full time. An extra bonus: there are reloc brackets with spot light mounts on them. It's definately the option I'm going to.
-X