I've never had much luck with prying them out without breaking them. I suppose you could remove the door cards and pinch them out from the inside but that's just way too much hassle to be able to reuse a set of clips (for me anyway haha).
I bought a whole lot of them a few years back from an eBay vendor located in Kazakhstan of all places. They sold them new and they claimed they were genuine. Was quite cheap.
Did a quick search on eBay and looks like there's a fair number of listings.
http://shop.ebay.com.au/i.html?_nkw=....c0.m270.l1313
Make sure you buy a bit of both though. VW used two different clips depending on where the holes were located - some are raised, some aren't.
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