I don’t sell direct, I don’t have a publisher, and I don’t do bulk orders. Amazon handles all of that and I’d rather spend my time writing the next thing than running a distribution operation.
Paperback if you want to mark it up. Kindle if you’d rather read it on your phone — which, given the chapter structure, works really well.
If you’re outside the US, your local Amazon should carry it — .co.uk, .de, .com.au, the usual ones.