TMZ Sports spoke with the 5 top costume shops in the Philly area ... and they've all said their phones are ringing off the hook asking about the masks Chris Long and Lane Johnson wore to celebrate their "underdog" victory over the Falcons.
One shop in particular -- Masquerade -- says they've already gotten 20 calls about the masks before the store even opened this morning (plus 10 fans who came to the store in person), and now they're working to get a shipment before Saturday.