Post in Liberia, Guanacaste Province, Costa Rica

Hola! I have been in Tamarindo for a few days, and am regretting that I didn't bring my travel guitar with me. :( Does anyone know if there is a place where I could rent a guitar or buy one for cheap? I'm here for another week and a bit, then I go to Samara, where I'd have the same question! Muchas gracias, amigos!