Nicholas, unlike the other way around, there are many good people here in the UK who will receive mail and forward it to the usa.
I have spent 12 & more years having the most irritating position of requiring goods which are only available in the US sent to me. There is not a single INTERNATIONAL online pharmacy operating out of the US which will ship to me. For three years, Nick (RIP) an incredibly talented musician (I have much of his music self produced and issued on his self owned label, Daybreak Records) and seriously the most GENEROUS American, Californian to be exact, I have ever met... He never once told me his condition was terminal yet sent me monthly 'Red Cross Parcels' containing OC80, Greenstone alp, DAN5513 carisoprodol, the best and most effective I have had, now banned in almost every country but still badly needed by me, for whom it is the ONLY skeletomuscular relaxant that works... Robaxin (methacarbamol) is now the only one I can be prescribed and even the big F*ck Off 750mg ones only take the edge off.
For a country like that to send its products worldwide except the only goods I am particularly interested in getting by mail order is almost unbelievable when so many hundreds of thousands of Americans buy the best Euro meds, well it is frustrating and for a country so, err, retentive about (certain types of) libertarianism, the place that comes to everyone's mind when thinking about free trade, no tariffs, no limits, almost unbelievable, especially when the goods in question are by far the highest priced and therefore I guess most profitable in the world, well. I know that us over here will not buy things we can get in Europe of higher quality and much cheaper price, but just as you are unable to get prescribed things like Diconal (dipipanone) & Heroin HCl (diamorphine) which are considered essential and first line analgesics, there are many things n/a on Rx here which thousands of people would buy were the prices right.
But to return to your point, yes, you can always find somebody to accept delivery and remail and even repackage if the goods come in the sort of containers which would attract the wrong attention on arrival there; I would hazard a guess that Pharmacy Tubs of 1,000 & 5,000 would come under that heading and explain why they will not ship to the US.
PM if you want more information or even better, email me. Check your inbox for my addy.
Let's try working through a few problems we both face, what? Solutions, solutions. Nothing is impossible. Almost impossible just means damned difficult.