Want to Buy WTB: Quantity Portra 800/135-36

I've settled on shooting a lot of Portra 800 in the future and am wondering where I can buy quantity. I'm sick of paying $10 a roll for this stuff and would gladly buy 50-100 rolls at once if the per roll price were significantly reduced. I can't seem to find a place that will sell quantity- 5 roll packs are seldom discounted- in many places the 5 packs are just $9.99 * 5.

Recommendations?

Thanks