Contact lenses are a commodity in an efficient market. It is similar to ordering a new book online, you know exactly what you are getting.
That being said, the absolute last place to buy contacts is from or through your eye doctor. I was surprised that even Walmart Contacts are 50% to 100% higher than online prices.
For my last order I went through Vision Direct and they delivered very fast. But I generally just go with the cheapest.
You can go to fat wallet and look for the latest deal. That is what I do.
On my last big purchase I seem to recall that there was a $30 rebate from Acuvue and a 10% discount offered via Vision Direct. Since I am usually out of the country, I was happy to see that the rebate was via a Visa cash card and was good for 12 months from issue and I promptly used it on my last USA visit.
Kramer