I was looking for a voltage regulator for my 500SEL (W140). Found them for $28 at BuyMBParts + $12 shipping (which seems expensive to me, since it weights 2 oz!)

******** AZ wanted $24 but their minimum shipping charge to Canada was $16 or $18.

Autopartsonlinecanada.com has free shipping over $75. Their price on this part? $81+tax!

A little insane.. I will still have to pay GST in either case, so would only have to pay an extra 8% PST in bringing the item from the states, where I can get it for less than half the price!

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