well there is nothing to be scared about when it comes to ebay... I just bought 2 lips from Racingteam Hofmann (based in germany and received the lips in 3 days).

Racingteam Hofmann

or you could look in the clssifieds on Vwvortex.com..

VWvortex Forums: 4x100 Classifieds

as for center caps either the above link for RTH has some or you can try JustMatz Store - Categories