Ovi Store is located in Finland, so when you buy anything from it via credit card and you're not in Finland, your bank will charge you an international transaction fee. This may come as a surprise mostly to Americans because the other app stores sell from within the US.

When I was on Android, I also had to pay an international transaction fee when buying from Android market because I was in Germany and the market was selling from Switzerland.

Please consult your bank on transaction details before complaining about Ovi and whining here like $1 would ruin your life.