SanDisk Extreme 64GB CompactFlash CF Memory Card works with Nikon D300, D300S, D810, Digital DSLR Cameras HD UDMA 7 (SDCFXSB-064G-G46) with Everything But Stromboli Combo Cloth and Combo Reader
Original Camera Parts Compact Flash Memory Card Reader Slot For Nikon D300 - Len Parts - AliExpress
D300-T44655 Dane-Elec 4GB CompactFlash (CF) Memory Card for Nikon D300
How to Insert SD Card in Nikon DSLR | SDHC memory card for DSLR camera - YouTube