Fred is one guy I told should definitely look into this interweb thing back in the ninetys...not interested. but I bought stuff from him all the time from those lists he mailed out. all you needed was a little patience and you could score really great stuff mostly really cheap. I would call him and he would tell me what was still available. it was all much more peaceful back then when people didn't expect instant service. I am surprised he made the leap, halfhearted as it may be, at all. the world needs more people like fred in my opinion.
but I digress, continually, only to note that I do not think the only option to the UK etc from USA is priority mail. ask for a priority mail rate sometime to say Croatia. it will be in the range of 75$ for a one pound package...pretty much the same rate as to western Europe. its totally outrageous. now what you DO have is the good old "small package" class, it is airmail but somehow not "priority" and there are certain rules you have to follow including that there is merchandise only in the package, no packing slip, no note to Mom, no photos from home, nothing but the object of desire as it were. and if you tell the postal person there is written communication in there it cannot go that class. and of course they have the (seldom exercised) right to open the package to ascertain the contents for themselves, so you do have to realize that involves consequences.
if and when you get to that point it is quite possible you are then stuck with the "Priority" route. but do realize sometimes all this varies based on which post office you are at. some are very busy and people are gruff and want you gone asap (big cities typically) but some are more helpful and will suggest ways to comply without really having to pay the maximum rates (small towns typically...everybody gets to know everybody and they are typically much friendlier and willing to discuss options, even with strangers). theres only so much they can do but up until sort of recently there were some back doors and protocols you could use to reduce rates. sometimes driving out of your municipal area to an outlying country town will pay back, but remember you are spending the $ to get there as well so saving 5$ on shipping may not mean much if you spend 10$ to get there.
the USPS has become prohibitively expensive to ship to and the problem is I doubt very much you will find other shippers (UPS,FedEx, etc) who will do it for much less.