Basic Shopping Cart Functionality suggestion

Question

This is really one for the ideas section.
In addition to the multiple fields on one line suggestion.
I know a fully blown shopping cart is not going to happen here as Randy has already mentioned but even some basic functionality would go a long way to providing a basic "in-form" alternative.
It would involve being able to have "total" fields that would for example add or multiple or subtract the totals of other cells in which data has been entered and would really need the multiple fields in place to be effective.
For example - a basic widgets form... maybe not so basic but shows some potentiality.
Column A        Column B       Column C      Column D     Column E    Column F      Column G
Product            Price            Quantity         Reference     Total          Discount         Total
Widget A           $1.00            _____            _______      $x.xx           $x.xx               $x.xx
Widget B           $2.00            _____            _______      $x.xx           $x.xx               $x.xx
Widget C           $3.00            _____            _______      $x.xx           $x.xx               $x.xx
Widget D           $4.00            _____            _______      $x.xx           $x.xx               $x.xx
Totals                                       xx                                     $x.xx           $x.xx               $x.xx
Postage                                                                                                                      $x.xx
Total Payable                                                                                                             $x.xx
Column B would require a new text field type that is unchangeable by the user that reads as a number.
Column E would multiply the price in B with the quantity in C
Column F might for example look at the quantity in C and calculate a 10% discount if 5 of more widgets of a particular type have been ordered
Column G would take the total in E & subtract the discount in F
The totals would add up the entries in all the above data
If someone had a second page of items, the top of the second page might have a cell option which is equal to the total of the previous page (ie let this cell=that cell)
At some point we would be able to determine what data show up on the paypal receipt and which cell has the final total for the Paypal payment.
While it doesn't have the full add to cart functionality, within the form it would do the same thing.
Fully blown shopping carts tend to be expensive & for those of us that don't need/can't afford one for what we do, this would go a long way to providing a good alternative.
To be honest I'd pay extra for this kind of thing. Adobe's doing some amazing things with the like of FormCentral,SendNow,EchoSign etc - I'd really like to see this addition considered.

Answer 1

Obviously it wouldn't have stuff like stock control and up, customer sign-ups with returning customer features and so on that full shopping carts have.
Would open the possibility for optional weight based shipping calculation if you assigned weights to each widget - multiply by quantity & add totals...