Tabling is extremely feasible in things like artist alleys! there are lots of furcons where- especially if you group up with other folks- you can make and sell art at a table just by walking up and signing up! It's nice to have small stuff like stickers to sell or hand out, and an active practice where you can draw stuff for people there at the place!

thanks for the encouragement, I found out there's a local comic con near me but it's in one month and I'm not sure if I can prepare all the stuff by then it also costs like 150.