Setting different prices for different store or website?

You can set price per website basis.

you need to go to System->Configuration->Catalog.

Then in the tab "Price", set Catalog Price Scope to "Website" instead of global.

You can just set the price for all store views belonging to that website, especially to set up different prices for same products per store view of each store. It means that if your store has many store views, you can absolutely set up various prices for the same product for each store view.

For example, if there are two store views in a store: English and Germany and you want to sell a product at two prices with its own store view currency such as £20 and €35 respectively. Magento default cannot allow you to do this thing at all. Therefore, if you want to do this one, you can use an extension like Multiple store view pricing I used to find on Magento Connect

https://www.magentocommerce.com/magento-connect/multistore-pricing-extension.html

It seems that it can also helps to set up base currency for each store view to replace for default currency as US Dollars of Magento.

Ok, I found that it is possible to set the price per website. I just got a little confused as the selector (upper left corner) did not allow for selecting the website level but only the store view level. So I tried out a few things and found that if one wishes to set the price on website level one has to select one language (store view) of that website in order to set the price. The price is then set for all store views belonging to that website.