A small company in the Ukraine has been manufacturing flash carts for Super NES, Sega Megadrive, and Sega Master System. These carts all use standard SD flash memory (no SDHC support) to load the ROMs with the FAT16 file system. Unique to these flash carts is that they are made in the Ukraine, rather than the typical factories in the China Industrialized Zone.
The infamous shop Tototek has recently become an official reseller of KRIKzz products so head on over there if you want to buy. The Sega flash carts are much more affordable than previous flash carts from other companies at only $80(+shipping) a piece, however the SNES flash cart is still a bit on the heavy side of price and on par with other manufacturers while coming in at $131.99(+shipping).
Head on over to the link below for product technical specifications and more images of each device.