That price appears to be for a single adapter.
I understand being on a budget, but really, how cheap do you want to go for a part that keeps your wheels attached to your vehicle? $150-$200 for a set of adapters is quite reasonable. I paid the extra $ for the Spidertrax because I know they're hub-centric and built well.
1994 5.9L ZJ, retrofitted UC package, NP242 swap, 17" JK Moabs with 32" BFG MT KM's.
The Jeep of Theseus