Yes, I've heard from people with mid six figures of inventory in Nike.

The trick is not to pay full price, use discounted gift cards, rewards, etc.

I don't do clothing, but I've used similar techniques on many other categories. Plenty of people have large businesses moving goods from retail to Amazon.

Ok - so any software/tools used in this? It seems like a niche that would be underserved but wondering if there is stuff that is especially used in this field.

What about stuff from Europe - is this mainly an American thing. sorry to be asking about stuff that you probably only know a little bit about, but you obviously know more about it than I do.

Yes, plenty of tools. Tactical arbitrage, oaxray are some popular ones at $99/month.

I do some of that and some wholesale and try to stay informed on what others are doing.

I know there's a tool called FBA Wizard used by some UK sellers, and tactical arbitrage has UK support as well but I don't know that much.

I have bought stuff from amazon.co.uk and sold on amazon.com when the price difference was large enough in the low 5 figure range, really just a handful of products that I sold a bunch of.