Check other major outlets including uhaul, along with smaller local shops like RV part & service dealers, custom fab shops, etc. Many, including myself, bought ours from wrecking yards. I think I paid 40 or 50 bucks for mine.
Also ask yourself what your expecting to get when you say "kit". You'll need a a ball mount and wiring kit as well for your Pathfinder unless it already has it installed. You'll also need the correct size ball if you intend to tow a trailer with it. Check the trailer to find out the exact size ball you need. If you need to wiring, there is a topic here covering that install.