The bulletin boards at your local gun clubs would be the best and cheapest; high-end would depend on the model version. Beretta's 68X series high-end versions are the EELL
Next would be the classified sections on sites like Shotgunworld.com, Doublegunshop.com and similar sites that focus solely on shotgunning. After that, sites like this one might attract a little attention, but there really aren't many here who fancy target shotguns over the slug/HD variety
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