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Solo is running a Pi day sale with escalating discounts. The coupon code stacks with sale prices. The Pi Ultimate bundle includes a bunch of accessories, the gas burner option, and a stand. It is currently on sale for 599. Add a filler to get your total over 600 and the coupon takes off $ 120.
I find solo products to be pretty expensive in general, but stacking the sale price with the coupon code makes this a pretty competitive price for a well reviewed pizza oven.
Note that these appear to be on backorder, ship date was listed as 3/29 when I ordered.