I am quite sure you could find a good horse at a fair price in the UK at this time. The $/£ ratio is currently about 1.50$/£1 which is low by historic standards. So come along and fill your boots.
However there is one little thing you may have forgotten - although horses can swim well, they can't swim the Atlantic - especially at this time of the year.
And whilst some horses might be named Pegasus, horses don't come fitted with wings. So please add in the cost of freight.
Every breed you can think of is here but tell us what you want to do with the horse and maybe we can tell you where to look. (PS buy QHs in the US)
Now I know where there is an absolutely beautiful ex racing black thorobred 15h.2 gelding well looked after by a knowledgeable good rider - perfect for a young woman moving up from ponies to horses all for less than $5000 ex stable. Ask the young lady who owns Sonnie, then I am sure she will offer to sail the Atlantic with him.