Charge.com Cardservice
Instant Approvals and Activation, you pay $0.00 for setup and application fees for your merchant account and pay $0.00 for your software to accept online payments (a $395 value)!

Electronic Merchant System
Instant merchant approval and activation. Most financial institutions "shy away" from internet merchants but Electronic Merchant Systems' extensive experience in the internet transaction processing business allows them to have one of the highest approval rates in the industry combined with exceptionally low processing fees.
 

2checkout.com
$49.00 sign up fee. Other than that, there is no application fees, no monthly fees, no leases. No Waiting Weeks, Start Selling in just a Few Minutes. No Term Contracts. No Equipment or Software Needed. Easy to use Plug–N–Play Code. Simple Commission Fee Structure. Supports Recurring Billing. Works with Existing Shopping Carts.

Clickbank
If you are selling digital, downloadable products, (not physical goods), then Clickbank can help you accept credit card over the Internet. There is a one time $49.95 activation fee but no monthly minimum or gateway fee.