You may get a special rate from USPS. I ship a lot of stuff from ebay sales and just the other day, one 8lbs box 15x10x15 from here to 92692, Mission Vjejo was $55.- priority mail
I don't know how heavy one wheel is, but it may be in that neighborhood. UPS for these sizes and weight is always more expensive, especially if you ship to a private residence, not a business.
And forged Fuchs wheels for $100.-/each are inexpensive. They will go up as time goes by. I just bought a set of 6x15 Fuchs Porsche wheels for a client's car for $1,800.-