Their biggest issue is that they're pre-orders and aren't shipping immediately. I completely understand where they're coming from. Don't you? But, It should be a simple matter to find a situation that works for them, works for us, and works for everyone else in the community.
Well, that simple matter is called
https://en.wikipedia.org/wiki/Letter_of_credit . People routinely have been paying that way for importing the produce that haven't even grown yet. I feel weird explaining to the highly educated people what I learned as a kid from the bazaar fruit importer.