I'm designing a site to sell blinds, so my product is custom made to my customer's measurements. I need to be able to have my customers choose sizes, which is easy using attributes. My problem is that the price needs to change based on what they choose. For example:
Say my customer needs a 24x48 blind, so they choose 24 for the width and 48 for the length. I can't just say add x amount because the next blind they need may be 24x47 so adding an amount wouldn't work. Maybe I'm just being dense because I'm familiar with attributes, I just can't figure this one out. I would like something similar to this website's Easy Estimator. http://selectblinds.com/wood-blinds.html

-zack