The pricing is issued by Tunze, they print a catalogue in euros and convert it for all the other currencies of the world. He starts with a retail price and works backwards off of that. Typically everything is done direct to the shops with the exception of the US, France and South Africa. In these three countries their are distributor because distance, language and custom barriers as well as legal difficulties make it to difficult otherwise. Basically if something were to brake in one of these countries someone needs to be their to fix it. As for France they are very strict and one wrong spelled word or non french word on a document will result in customs declining the product. Axel once told me France is more foreign than America even though they are neighbors.
Is your tank glass I take it? If you don't have any braces to accomodate you only need set 3000.244 which is longer screws to accomodate the thick plastic trim.