sinexpensively

Cheaply-purchased/accomplished by behaving in a less-than-proper manner towards whomever provided your desired goods/services.

Tiffany didn't have the money to hire someone to put up shelves in her basement, but --- knowing that I always have the hots for her --- she called and got me to come over and do it in exchange for a little nookie-wookie afterwards. One might say that she got the job done "sinexpensively".