Hi Brad,
The Cart currently has a Minimum Order Amount setting which allows you to set a minimum order amount for your store however the minimum order amount is calculated on the subtotal of all the items in the cart not a specific quantity of the items added to the Cart.
If you are interested, our programming dept. is available to program the ability to set a maximum order quantity. To receive a quote, please fill out the quote request form at the following link:
http://www.smith-consulting.com/servi...
Hope this helps!