Norway is not set up for this, and I advise against it. I do not believe you will save any money trying to send packages to locations in Norway. The logistics alone would be a nightmare to try and organise. You either bring a large stock from your own country and accept the weight issue on your bike (getting lighter every day at least). Or bring a few to start you off and buy the rest of them in Norway. The cheapest place is XXL sports shop, where they are around 90-100kr. There is a new page all about food and drink options here: https://cyclenorway.com/food-drink/