we were lucky.[]
I have, also all grain leaves here un paid for up front, (sometimes owed the price of a decent tractor) as does cattle and fat lambs, just saying.
Sold quite a few cows earlier in the year via Beeston. Got paid.
Few weeks later, just sent a couple. Didnt get paid!
Id expect to pay a deposit on a special order. If its a large amount of money, and there is a risk of the supplier going bankrupt, the deposit, or even the full amount can be lodged with a bank. They keep it until the product is delivered, and return it if not.