i cant think of any SAHM job where u dont sell/buy things!! if u can find one,then let usall know!!!
i do avon and depending on your personality towards your customers,you can earn a fair bit - im the only rep in my area so iv got a pretty good income from it.i also take a few books the gym with me when i go!!
why dont u teach urself something craft like? if ur a dab hand on a sewing machine,make things like baby blankees,mobiles,activity cubes.and sell em on ebay.i was gonna do this and i even brort a few books to help me with designs... then i remembered i didnt have a sewing machine - hahaha!!! and a decent one is pricey so i left it in the end!!!