Memory Card to USB IC?
The cheapest way of getting the part is by buying a card reader from your favorite eBay Hong Kong vendor.

I was involved in purchasing AU6350s for a project.  The process involved lots of transcontinental communications, purchase orders, international wire transfers, and shipping accounts.  The developer board was about $150 if I remember correctly.  The Alcor people are nice, but there is just a lot of bureaucracy.

The Microchip USB stack has a card reader as one of their example projects.  It works fine, but is very slow compared to the dedicated chip.  About 50 times slower by my memory.