Value Based Seamless Integration

I’m looking for a third party payment gateway or merchant account which I can seamlessly integrate into a site. I have several clients requesting a payment system that never bounces users to another site like paypal or google checkout. Our aim is to collect all payment and cc information on our site.

It appears as if PayPal has “Website Payments Pro” for around $30 a month. I’ve also looked into Google Checkout, but I don’t see an option or information on an API to integrate like this.

I suppose my optimal solution would be a company that allows this functionality, but doesn’t have a monthly fee. The trade off would be a higher discount rate.

Does anything like this exist?

The best deal I’ve been able to find was though a company called Processing Point. If you’re hosting with Host Gator you can get a rate at about $10 for the features listed above.