Merlin UK - thumbs up!
Sadly, most UK mail order sites no longer ship Shimano parts to the US. Merlin is an exception. I ordered a complete 8000 group at substantial savings over US prices. It took not quite two weeks to arrive, a little longer than I expected. The parts were individually packed in very substantial cardboard boxes and the lot was in a larger box with plenty of bubble wrap. I don't know how long this can continue but for now there is still a good alternative to the jacked up Shimano USA prices.