Chiming in, too. I've had an N800 and an N810 since Feb. and last month bought 2 SanDisk 16 Micro SDHC (one for each device). Got them for around $45 each from Digizone Technology. Nice part was that each came with 2 adapters. Both cards are working flawlessly.
Digizone Tech. ref. SDSDQ-016G-3A Bulk Package (free SD slot and mini SD slot adapter)