Shopping cart that removes item from stock when added to cart?

I'm looking for shopping cart software that removes items from stock when it is added to the shopping cart, NOT once the customer checks out.

Anyone know something that does this? I usually work with Zen-cart and OsCommerce but they don't do this.

Or, point me in direction of other free and/or cheap shopping cart solutions I can look into?

I would suggest reconsidering this feature, as it makes it very easy for malicious users (not to mention casual shoppers who abandon their carts) to drain your store of its inventory, leaving you with nothing to sell. Even if you have the store automatically restock if a purchase is not made within a certain amount of time, you are still likely to miss out on some sales due to inventory being tied up by customers who ultimately don't buy.

Thanks for the heads up. I'm aware of it, and it's been pointed out over and over again.

Doesn't seem to be a cart that handles such a thing, anyway.