I guess it all depends what you're looking for. There is indeed a very big difference between a basic "shopping cart" that keeps track of what a customer wishes to buy and saves to a database/emails the results and a proper "store" (i.e. containing online payment methods et al).

If you're looking for the latter then the maxium "you get what you pay for" is (in almost all cases) true (that doesn't mean that something expensive doesn't have holes - look at most Microsoft products for instance...).

If on the other hand you're looking for just a cart (as in Corion's post) then the suggested solution may be on the way to what you're looking for.

In all cases though you do need to consider the security of the situation and the information you're passing - how sensitive is it? what value would it have if it fell into the wrong hands? etc Whereas it probably wouldn't be much use to someone to know that an anonymous browser bought a red t-shirt, it probably is to know that "Mr A Nonimouse of 123 This Street, Big Town, AB1 23CD" has a credit card whose number is 1234-4567-xx... etc

Although remember that nothing is ever guranteed 100% secure.