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[ASOIAF/GOT] Where did the Dragon Eggs come from?

It's been a while since I've read the books, but is it ever mentioned how Illyrio Mopatis came into possession of the Dragon eggs he gave to Daenerys? Where did he find them? 
Were they the offspring of the old Targaryen dragons? 
Did he find them in the wild? Does this mean that there might be a possibility that there are somewhere other dragons living on Planetos?
gpt
Illyrio claims that they come from the Shadow lands, east of Asshai. It's unlikely he obtained them himself, so the question is how many degrees of separation there are. Did they come directly from the Shadow lands, or did the eggs change hands? Did he place an order for them or send someone to get them directly, or did he just happen upon them or otherwise had them already in his possession?

Dragons are rumored to originate from the Shadow Lands, so this lends credence to that being the origin of the eggs.