I recently needed some 1/4" inch Acme threaded rod and nuts for my Burrell-Boydell traction engine but could find no UK supplier of these items in carbon steel.
An on-line search revealed a US company named 'Wholesale Tool' in Tulsa (only 24 hours from, for those with long memories) and they take PayPal.
I ordered a 3' ft length, cut into 3 for easier packing, and 3 nuts. The bill came to $23.65 but the postage was $52.75!!! Total in GBP was £58.65. Even so I needed the parts so placed an order on 6th Feb and received the parts on 15th Feb which is what I would call good service.
The parts are of excellent quality and will enable further progress on my engine.
Brian