Can anyone tell me why RFID keyfobs of card for that matter vary in price soo much?? is there a difference in them somewhere i cannot see or know about??

jaycar have RFID key fobs $895 for 100 of them.
RFID Tags - Keyfob Style - Jaycar Electronics
ebay i can get 100 of them for $31.69
125Khz EM4100 Compatible RFID Keyfob Yellow 100 pcs | eBay


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