The Picasso and Dali show up regularly on eBay. I've purchased the pair twice (one for myself and one for a friend). The second pair only cost me 1/3 of what I paid for the first ones. Live and learn...
I've seen another Dali but it's not as nicely detailed as this one.
I haven't seen the Miro but I'll watch for it. I'd like to add that to my collection as well.