Set of prints lottery or auction?

I wanna sell some illustrations i got printed. I was thinking on sing them and number them too, so they will be extra special and unique. They are HUGE like 43 cm tall, mate couche printed on high quality, and they would look lovely on any wall.

I'm thinking on making sets of three prints and make a lottery or an auction for these.

What do you think?. Anyway they will be super cheap, like USD $1 or less.