Might check out Ribcraft; they're not too far away from you, I think.
Well, OK; they're in Mass. Still closer than Europe.
I'd suspect that there are boating mags on the East Coast similar to the Left Coast's "Latitude 38", which often has larger RIB's and inflatables listed for sale as tenders to larger blowboats.
Might be more productive to see what's being offered and research them, rather than try to hunt down a specific brand, as RIB's aren't all that popular in the US (yet.)
Luck;
jky