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Hello Great Forum

I have an odd request.

1. This store sells business cards in bulk of 250, 500, 1000,

2. We of course have many in stock so they can order many boxes as they want.

3. What I want is to limit the amount of items they add to the cart as 1

4. Which means I have 10,000 in stock but he can only add 1 at a time to add to cart.

5. I have a drop down box for the customer to choose the 250, 500, 1000 but I want her to only have the ability to add 1 box to the cart at a time.

6. If he wants to boxes he has to add the 2nd box to the cart and he can only add 1 at a time

So, what do you think can this be done?