It is the result of a class-action lawsuit where anyone who bought an Epson printer in a certain timeframe gets a $45 credit for each printer. It has to do with the misrepresentation of ink use, mostly because the chips tell you the cart is empty when it is not.

If you registered your printer and it is eligible for the settlement, you should have gotten something in the mail. I don't have the info in front of me, but if I find it I'll post it here.

I bought 2 printers in the timeframe, so I have $90 to spend.