When you just need one to a few of something, no vendor is going to bother with giving you quotes/invoices/etc when they know you a) aren't a big company to kee

When you just need one to a few of something, no vendor is going to bother with giving you quotes/invoices/etc when they know you a) aren't a big company to keep around for future business and b) aren't buying enough for any of that extra work to be worth it. If I'm working on an SBC and need a couple floppy driver chips, I'm not going to find any "real" vendors that have them in stock. All I'm going to find are second-hand dealers that might be selling fakes.