Certainly a good price. My only reservation is that the PT2264 chip these systems use is a hard-wired address, it's not programmable like the 1527 Learning Code chips. As long as you can live within the limitations of six switches, these should work. If you buy two of these systems, it appears that they'd have conflicts as the remotes would drive multiple relays.
The following claim seems bogus if they're really using the PT2264 chip.