We have plenty here in the US. I live in a town of population 70K and we have at least a dozen charity shops and probably as many consignment stores. Any place in the US I've spent significant time I've found at least one nearby charity shop for the rare occasions I needed a suit or peice of furniture.

I don't know who told you we haven't adopted that system. Tell them to look for a Salvation Army, they're like the Star Buck's of charity shops around here, there's one on every corner.