where to buy cap mouldings for beadboard

I’m looking for a place to buy cap mouldings for beadboard I’ve installed. I bought the beadboard at Dykes Lumber, but the only cap moulding they sell is pretty bulky, and I’m looking for something that would sit more flush to the beadboard/wall. Anyplace besides Dykes in the city to go for this and/or online for that matter? Thanks in advance!!