Hope you don't mind my jumping in here but if you are spending more than $25 on Cathe videos, that means you are probably ordering at least 2 videos (amazon.com will not ship a $24.99 item for free--I've tried!). So, you get a $5 discount, which in essence is the shipping cost. So, ok, the chart shows shipping is $6, when you do the math, you pay a buck for shipping. If you order 3 videos, the discount goes up to $10, so then you are not paying shipping charges & still getting $3 off your order.
I know that's not how SNM communicates it but it's how I do my thinking. Just something to think about.