Buying a bike in Ireland?

Okay, here is my half-baked plan: I will fly to Ireland to see the country.
While there, I will buy a folding bike. After a couple of weeks, I will put
it in a case and bring it back to the States, where it will be a "used" bike
when I bring it through Customs.

Does anyone have any thoughts on this plan? Any ideas for a good but
reasonably priced folding bike? A Dahon perhaps? Do they sell these in
Dublin?

Pat