...and the slightly longer answer from me

I imagine you are looking at different brands. I guess this might be confusing but here we go.
There are several brands of stilts available but because the stilts are a different brand doesn't mean that they are a different product. For example PoweriZers (you named this brand) and projumps are exactly the same. PoweriSers and 7's have their own factories. These are pretty much the only entry level stilts. Anyway, just make sure you are comparing the same product for starters.
You will notice there is a big difference between the cost of Powerizers/powerstriders and projumps (despite them being the same product). Projump offer very low prices and it seems no other retailer sells much below the £200 mark. The next thing you will notice is the price of stilts in other counties being different to that in the UK. Again, this is because of projump offering very low prices. In other countries there isn't such a dealer/competition so they can set prices at they wish.
I think you have been comparing projump stilts being delivered to sweden to another dealer in Norway. It is for these reasons they can cost much more in one country compared to another.
I'm sure you will get a reply here at some point giving you an answer about projump delivering to Norway. If not send projump an email
