Best Domain tools and shopping cart.

[SIZE=2]Hi,[/SIZE]
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I am looking for the best domain tools IE check availability and order it. I am also looking for a shopping card that I can offer hosting for order.
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My main business is web development and hosting of those clients, but I am branching out to domain sales and general hosting sales.
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I just need some simple scripts, it doesn?t have to connect with interworx at this time I can create the accounts myself, and I can order the domains myself.

Any links or ideas would be nice.