Does anyone have dynamic pricing on their store?

I have need to create dynamic pricing like this post:
http://www.zen-cart.com/forum/showthread.php?t=33423
but wondered if anyone has something similar on their store I could look at? I need to be able to have a price dependent on square inch and would like to have it show the price when they enter their width and height, rather than when they add it to the cart. I do not yet have Zencart installed for this particular store. It will be the most current version (if this works the way I'm hoping). Can anyone post some links to store that have this?
Thanks!

Hi There,

Check out this mod.

http://www.zen-cart.com/forum/showthread.php?t=70577

I can't recall if I use this one but can't find any others...

In mine I had attributes that when you select some larger sizes it would update dynamically (Instantly when the drop box in my case was selected.)