Wanted: banjo (trade you a cello?)

Short story: I'm aiming to sing my fiance's favorite song at our wedding reception, but need a banjo (and to learn to play banjo). Hoping someone will do a straight up trade. I can't afford two instruments right now.

Cello: non-descript learners cello, new bridge and strings. Bought on CL for $400 + $200 of work. Mostly collecting dust.

Dear banjo gods, please help.