It's at 214 Third Street, corner of 3rd Avenue, opposite the Gowanus Canal.
This is an out-of-the-way location, opposite the Gowanus Canal, and has a parking lot. Those who depend on public transportation get no help from the web site; as far as I can tell, the only MTA service that goes near the store is the B103 bus, south on 4th Ave and north in 3rd. That's no use to me, so I guess I won't be shopping there. A pity, because it looks very inviting.