Synergy Digital 4GB, SDHC Memory Card, Compatible with Nikon D5100 Digital Camera - Class 10, 20MB/s, 300 Series
Amazon.com: Nikon D5100 Digital Camera Memory Card 2 x 4GB Secure Digital High Capacity (SDHC) Memory Cards (1 Twin Pack) : Electronics
Nikon D90, D3100, D7000, D5100 Memory card slot
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Deyuer Memory Card Door Cover Professional Protective with Spring Iron Plate Digital Camera Card Slot Cover Repair Parts for Nikon D5100 D5200 D40 D3200 - Walmart.com