LA's a pretty big place but Hollywood has a "guitar row" on Sunset just east of Fairfax. There's a Manny's, a Sam Ash and a Guitar Center all within a block of each other. They all offer financing(which these days seems to zero down and no payments for a year). Also on the row are a Carvin outlet, a Mesa Boogie outlet, several used/vintage shops,  and a classical guitar shop. A bit further east on Cahuenga, on the Valley side, there's a West LA Music(they probably have financing too).