I've been checking locally and in the US for 20" tires and you just cannot beat the US pricing. I'm looking at savings of around 50% from local pricing which means I can put the savings into new wheels to soften the spend. Since I'll be taking a family trip shortly to the States I'll just order the tires and pick up at one of those US address depots.
'05 GMC Sierra SLT Z71 CCSB 4x4
'02 Regal LS
'00 740i Sport