I made a regular ol' contact form and added a product a conditional field - where someone selected an option (emergency help) from the dropdown and it brought the product up; no quantity, and just a flat rate. This field was to hide and remain empty if they chose another option from the dropdown...
I got an error from paypal that the cart was empty if they selected another option that didn't include the product...
I can dupe and re-create the form if someone wants to test it out and look at it... It's not urgent; so I didn't post it to priority - and well it's still in beta anyway :)