Bulk c/u rates

Recently I was able to sell off about 10k of my extra at a bulk rate of 6 cents per c/u with the buyer paying shipping costs and paypal fees. They’re interested in buying more when they get my last shipment, but don’t want to pay the extra costs now, so my price per card would be under 5 cents. The bulk rates in the US that I’m aware of are all around 5 cents per card without them paying shipping/paypal. Does anyone know of a place that might be able to give me a similarly good deal?

Trollandtoad ATM is buying 0.05 each