Don't know if this is up and above your requirements but you can talk to them about controlling and placing manual orders
http://2checkout.com/home.html
One of the biggest out there w/ plug and play shopping carts
$49 one time signup fee
$0.45 per Sale
5.5% of Sale Amount
30 Day money back guarantee
No application fees
No monthly fees
No statement fees
No leases
No SSL certificate to buy
No fees for ACH deposits to U.S. or participating Canadian bank accounts
Check Payment or Low Cost Wire to Non U.S. Bank Accounts
FREE shopping cart
FREE code for your web site
FREE on-line tech support
No waiting weeks (Getting started immediately)
No term contracts
No equipment or software needed
Easy to use plug-n-play code
Simple commission fee structure
International suppliers accepted
List products & services just about anything
Supports recurring billing
Works with existing shopping carts
Automatic purchase order notification
State of the Art fraud detection
Great for simple or complex needs
Comprehensive account management tools
Robust shipping options