Nopes, no idea about prices. Recently got my cng tuned and my plugs may be good for another 1000 kms. Please share the prices when you check them. Thanks
Another (and the proper) way to check if a certain plug would suit your car or not is to know the 'engine heat range' of daewoo. i believe plugs have that range (for which they are compatible) mentioned on their box. this way you can even opt for a 2tip/4tip plug provided you know whats the engine heat range of the car that you are installing them in.
Try asking that from testdriver/shaan on the daewoo fan club or anyone else that has a manual. You may also visit Mr iqbal at daewoo plus (in g10, behind urdu university), I've heard he worked in daewoo korea, is very knowledgeable and has had this workshop for the last decade. He might be able to tell you the engine heat range right away. When you get to know this, inform me as well 