If color doesn’t matter, I’m pretty sure the LUG has a lot of 8×6 plates in its supply, at least it did at one time.
Did you actually buy all those dark blue wedges? I would not guess that a piece like that would be so cheap. I’m definitely a proponent of finding pieces on BrickLink that are plentiful and cheap cause nobody else wants them, and have already benefitted from them (see also: Ben’s orange castle, Ben’s orange GBC).