You'll never have a long term relationship with a source. They all disappear after a few years or they change things up and start moving too much product and the quality suffers, or they get lazy and ship really slow.I see. I have an issue with ordering gear in bulk from a single source. Once I found one of their products was bad, I immediately lost my trust and wouldn't want to use anything from them anymore.
Brewing 1000 vials at once or even more is hard and requires someone that knows what they're doing. This is one of the reasons I request crashed vials from sources so at least I know there's something in the vial, however my main source that was great for years exit scammed and another source I used for a couple of years had floaters in his brew upon really close inspection and I ended up tossing dozens of vials.
Can't trust anyone, that's why I brew my own.
With PPL reshipper it made it a lot safer to move more product.