I bought a set on Amazon for $35, but haven't installed them yet. The VW dealer service guy told me that as long as you buy canbus (error free) bulbs, you won't have a problem. You can spend a lot for the same bulb that you can buy online. They all come from China. I bought my interior LED's from superbrightleds.com. They were very knowledgeable when I wasn't sure what to buy, but were a lot cheaper than some of the other vendors.
Here is what iI bought: