For those who might be interested, I just received a SD card I purchased online. It was an OEM model that was pretty cheap, $95, and with a storage capacity of 32GB. I wasn't sure if it would work in my F90BT, but others were reporting success and that gave me enough confidence to purchase mine. Anyways, it worked perfectly. I thought I'd show a link to the unit I purchased just in case anyone was interested, as it seems the purchase of SD cards and USB memory sticks are touch and go.