I've bought quite a few items from the USA on eBay, without any problems. However, I've stuck to purchasing books (which don't attract import duty or VAT) or items with a value of less than �18 (on which the tax and duty are waived).
If you're purchasing an item valued at �125 you'll almost certainly have to pay the postman substantial charges before he'll hand your package over. The rate of duty varies but, as an example, here's what you'll pay if the item is cotton-based clothing (which carries 12% import duty for imports from all non-EU countries plus an additional 15% duty for imports from the USA because they're in breach of WTO rules on cotton trading):
Import duty = �33.75
VAT = �29.53 (VAT is charged on the goods, on the import duty and on the carriage charge. I've assumed a �10 carriage charge).
Examination fee = �8
Total to pay the postman = �71.28
As stated, there are a few items (e.g. books) which don't attract charges. However, most items which are valued at �125 will attract charges roughly in the range �35 to �70.
Chris