We just added AutohausAZ.com to our catalog.  We’ve been trying to get these up on FrugalMechanic.com for a very long time!    They consistently have the best prices around for German parts, especially Audi and BMW parts.    Here’s just one example:  http://frugalmechanic.com/auto-part/bosch-f5dp0r–bosch-f5dp0r-oe-type-platinum-spark-plug-pack-of-1