Agree about Ebay, you might not be getting the right materials. I used to buy mine from Seelig Custom Paint, Sid Moses was the man in charge, but I heard he recently passed away. He had more selection of pearl pigments (and other stuff) than any one else in the biz. At least he did when I first started looking for a supplier, long time ago. Maybe someone else took his business over???
smartshoppersinc.com carries HOK pearls, available in premix, paste and powder. Best prices for HOK stuff I've found.