eBay - $3 off $3.01 using code PROMO3. Expires 6/17/19 23:59 PDT
I was offered the coupon when I was buying on eBay this morning
I would guess this is a YMMV deal. Ended up buying Nintendo e-shop card for approximately $7.66 after discount. 43 available last i checked.
Edit - doesn't work on paypal digital gifts. Works on ones like G2A, MMOGA, or those individual sellers.
LInk for the deal info - said it is for customer's 1st purchase on eBay...but it worked for me as I've been purchasing on eBay for over 10 years...