Exclusive distros
Tend to run stupidly high markups.
I've seen this in a number of instances.
USA outfits take note when it's pointed out that high prices impact sales (especially when they realise they're supplying to order and the distro is making more money than they are whilst not assuming any stock risk)
There's also the issue of resellers "registering a deal" when buyers start investigating products resulting in the first one to win that race having a sale price higher than other resellers can even buy for. I suspect the legality of this kind of lockin is extremely dodgy and I've had resellers openly laugh at me when I've complained about it. (Boot on the other foot when you decide to buy from Germany for half their price instead....)