SD SanDisk Memory Card For Canon Nikon D3100 Digital Camera | eBay
Irene Inevent Memory Card Slot Door Cover with Spring Iron Sheet Repair Parts Spares Dust-Proof Memory Chamber Cap Replacement for Nikon D3100 - Walmart.com
COPY NEW For Nikon D3100 SD Memory Card Cover Lid Door with Metal Spring Camera Replacement Unit Repair Spare Part - AliExpress
COPY NEW For Nikon D3100 SD Memory Card Cover Lid Door Camera Replacement Unit Repair Spare Part - AliExpress
Amazon.com: Synergy Digital 8GB, SDHC UHS-I Memory Card, Compatible with Nikon D3100 Digital Camera Memory Card - Class 10, U1, 20MB/s, 300 Series : Electronics