Why can't I find any used trials motorcycles?

Why does it seem like it's impossible to find any used 125cc or 250-300cc trials motorcycles that are about 10 years old for about $1500-$3000.

I can find them in then UK for cheap but I can't get them shipped over because they're not more than 25 years old. It's some dumb law the EPA has.
Update: I've looked on ebay Mr. zeno
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