I set up an online portfolio recently at something called mosaicglobe.com. So far it seems pretty good, their free option has ads but they're fairly unobtrusive.
Right now it's just got a brief intro and some "yo mama" jokes I once illustrated. I recently colored them for purposes of this gallery: http://timrocks.mosaicglobe.com
Actually not sure how to caption this one.. Best I could do is "Yo mama so short-- she gets air just paying her bus fare!" But that sounds really awkward to me.
I would sort of like to sell them as greeting/insult cards if I could figure out how. Maybe some sort of print-on-demand thing. Or maybe I could print up a small number and take them to your weirder stores and see if they'd carry them.
Or go door to door...