Country-based prices

I'm looking for a module which can display different product price according to the customer's location IP address. e.g. US customers will see different product prices from UK customers.

Instead of adding taxes or shipping fee later, I'm hoping the country-specific price can be displayed at the store front. Currently, I only need the prices to be different for just 1 country (e.g. US). The prices for all other countries will follow the currency conversion of a specific country (e.g. UK).

Another idea is to implement a store-wide discount base on customer's IP address. The discounted price should then be displayed as original price at store front for that country-specific customer. If this method is used, I would like to have control over which product categories the discount is applied to.

Anyone know of such module or is interested to help with this? Let me know. Thanks.

You could use multi-sites to solve this.
One site is for U.K. and the other is for U.S.A.

Do you want different prices or actually just converted prices as you say: "The prices for all other countries will follow the currency conversion of a specific country (e.g. UK)."

If you just want converted prices then all you need is to switch the OpenCart currency based on IP address which should be too tricky. Drop us an email (info@antropy.co.uk) if you'd like us to estimate.