They state they sell scratchcards on their own website: https://corporate.ryanair.com/about-us/giving-back/

If you search "Ryanair scratchcards" you'll see recent news articles about them.

I've used Ryanair once in the previous 5 years, so my experience might be out of date. There was a time my job was taking me to "holiday" destinations for meetings, back then I used Ryanair more often as they often had the only direct route. Maybe the scratchcard sales are more common on those flights.