Steve where can I get the Behr regulator?

Also I want to buy online mainly for the cost savings. I am in the Dallas. TX area if you guys know of any parts stores that sell this item at a comparable price as online then could you let me know because I am dying without A/C. I am willing to spend an extra $20 to buy it in a store but the dealer has this part for $368 and I will wait for the $192 one rather than pay almost double.

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2004 CLK500
2000 S500