That's $80 each tire/rim... the least expensive Universal blackwall 21" tires run about $70 each, and new repro 21" rims run nearly $300 each...
Doesn't sound bad to me... do you have to go far to get them ?
The only other thing you might want to check is whether the rims spin true...
This summer I picked-up four 21" rims with 5.25 x 21 Acme tires for $300, and though I did well...