Price of Custom products

[jumping00]

My problem is,

my products come with the cable, and customers can ask for different length of cables.
ex, $2 per ft, and customers can order from 5 ft to as long as they need.

If I use "custom fields / cart variant", it's will be hundreds of options (6ft;7ft; 8ft;9ft;......)

Does anyone have a good idea to build this custom options?
Thanks!!

[Maxim Pishnyak]

You could find what do you want here probably - http://extensions.virtuemart.net