Rechroming is expensive. Are they 2/3 piece or are centres welded in?
Cheapest option if the centres can be unbolted is to remove them, get the chrome removed (acid dipped is best) then powder coated. Otherwise you can buy a polishing attachment for a drill or grinder and polish them up yourself, then look to get them clear-coated. I say acid dip as sand blasting creates a rougher surface and requires a lot more sanding before polishing or recoating.
If the centres are welded in then it's a huge PITA. You pretty much have to get the whole wheel stripped (costs more) and then it's waaaay harder to polish. I'd then just paint the centres and polish the lips, then clear coat the whole lot.