(50PCS)Ntag215 NFC Tags,Blank PVC Coin NFC Cards 25mm(0.98 inch)504 Bytes Memory,Compatible with All NFC Enabled Mobile Phones & Devices https://www.amazon.com/dp/B087M9FLM4/ref=cm_sw_r_cp_api_glt_fabc_JHYVE2XP6WF1RNH0N9GZ

I used these coins. I’ve never used stickers though.