So, firstly the UK. A boxed set of space marines (a full tactical squad) is currently priced at GBP25.
Next: Australia. The same tactical squad costs AUD65. At current exchange rates, this is GBP36.
Canada: 50 CAD, which is GBP27.2.
Denmark: DKK250, which is GBP26.5
Europe: 35 Euros, which is GBP27.7
Japan: JPY5700, which is GBP32.95.
New Zealand: NZD75, which is GBP37.74
Norway: NOK280, which is GBP26.5
Sweden: SEK300, which is GBP25.85
USA: USD40, which is GBP23.55.
So: congratulations to my American friends for having the cheapest space marine armies in the world! You're only cheaper than the United Kingdom -- which surprised. Looking very poorly though are the New Zealand and Australia prices, closely followed by Japan. Remember that Forge World is GBP46 for a tactical squad and you can see that they're not so far away from those prices still.