Dave's Dulcimers - it's under construction and there's nothing really there right now, but maybe someday...
I bought a hammered dulcimer from a David's Duclimers. Don't know if they do Appalachian/lap dulcimers, but the instrument I bought is sure nice! (Not cheap though - cost more than any other instrument I own.)

I bought a Gibson fiddle for $20 once. I fostered it to someone who ended up adopting it. Someone gave me a Harmony mandolin. I'm not a good judge of mandolins, but it seems like a decent one. My wonky index finger just doesn't like mandolins so I don't play it much. My mom bought me a lap dulcimer in 1973 for $60 new. It was made by Leonard Glenn and it's a very simple-looking instrument but has a beautiful sound. I have no idea what it would be worth now, but I'd bet somewhat more than $60. No matter, as I ain't sellin'!