I managed to find a set at Harbor Freight for $14.99. It had 6-10mm, 12, 14, and 17. Not too bad. Did have to drive quite a way to the nearest one though...

Worked great!

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k