Mervyn: Salesman Supreme! by @mitcdela (Mitchell de la Guardia)

Mervyn is a Cizerack (Ctarl Ctarl based creature) who was at one point in time a manservant, until his lady's ship crashed on a planet near a gigantic sales convention. He was the only survivor, and wandered without memory into the convention, where a new personality took root. If you want anything, he can get it. And he'll sell it to you even if you don't want it!