I'm looking to add a shopping cart to my site. Preferably free, with the option of having fixed price items, and dynamic priced items (i.e.) Purchasing a square footage of material charged per square foot, and having it appear in the cart as one item.
PHP based would be preferable, and if it can be compatible with my paypal merchant acount that would be ideal.
Yes, X-Cart is the best. I run it on my store.. You can setup options that change the price. As for sq. footage, I'd have to think about that, maybe you could set a variant up.