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"Tried to order Doug's also last week, with a 20% off coupon from advanced auto, no go.
It would have been nice for only $475 a set."

I ordered raw steel Dougs D453 from Advance back in Feb using their 20% off. Got them in 2 weeks. The discount maxed out at $50. Speedway Motors on ebay used to list them but they're stating "none in stock."