paypal button plugin that allows users to select their own quantity

HI,
I'm using the Avishi Paypal button plugin and want to allow the user to select a quantity of their choosing. It appears it only sends the quantity of 1 to the system. Are there any paypal button plugins that allow the user to select their own quantity? You can see what i'm referring to on this page:
http://blackchamberofcommerce.org/pay-golf-tournament-participation/