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A lot of folks use www.ceramicgrillstore.com
I got my swing grate from www.ceramicgrillworks.com
Everything else I got from the BGE Dealer or specialty "Hearth and Home" fireplace shops.
As for me, I buy the BGE accessories from my dealer. I buy the add-ons, like the spider, WOO, etc. from the Ceramic Grill Store, and I buy my woks, spatulas, etc. from The Wok Shop in San Francisco. Regular BBQ stuff can be gotten locally, most anywhere.