Gunbroker...Auctionarms...Gunsamerica...( on-line Auctions and Sales...)
Buyer be-ware, always...of course, look critically at the listing, the images, and the Seller's other Auctions/Sales, Feedback, if any...e-mail them with quesitons, dialogue with them...see how things feel...but overall, these are good places to 'shop', and one may do so without leaving one's Desk-and-Chair...and most Sellers are staight, honest, on-the-level folks.