I've seen these sites before but I can't seem to find a sample site now that I need to show a customer one... Looking for a site that allows the visitor to pay for services using $1 as the unit price and allows you to type in a quantity that would total the amount that you owe the company. I've seen it used for accounting firms or web designers who want to allow their customers a way to pay via credit cards on their website but for obviously varying amounts so that's why they use the $1 as the unit price. If you could send me a site you know of, I would greatly appreciate it. Thanks!
You can create your own PayPal shopping system by going to paypal and creating buttons, If you want to allow multiple purchases of an item you just select that option.
PayPal does make this very easy using their button factory and web payment features. You have to open a business account with them, but it makes accepting payments very easy with the "Buy Now" buttons. PayPal provides the HTML for the button and the form.