I have units similar to those (mine are from mylitco) and I paid £25 and they come with a years warranty -
I'm all for OEM but the MyLitco (or similar ones) are better, cost less than the OEM units themselves and don't need to buy wiring adaptors (at the same cost/slightly more!!!) to make them work. £70-80 is silly money for number plate bulbs sorry...
In VCDS there is a setting to turn off the bulb out monitoring for certain lights (eg indicators, front dipped, front main etc). That may provide some ability to remove the bulb out but won't stop the error of them not lighting I believe. Worth a try anyway!