Saw this while searching for a Pro Duo Adapter. Not a bad price since the Micro SD card adapter alone is usually 20 bucks.
http://www.bestofferbuy.com/SDHC-MicroSDTransflash-TF-to-Memory-Stick-PRO-Duo-Card-Adapter-PSP-Compatible-p-16613.html?currency=USDamp;utm_source=gbase&utm_medium=cse&utm_campaign=gbase
http://www.bestofferbuy.com/SDHC-MicroSDTransflash-TF-to-Memory-Stick-PRO-Duo-Card-Adapter-PSP-Compatible-p-16613.html?currency=USDamp;utm_source=gbase&utm_medium=cse&utm_campaign=gbase