damn, that sounds like it would be a lousy business to be in. But I guess I'm wrong because they did it?

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.