This is a timely question for me. Tonight I did some comparative online shopping for my Biomedics Toric lenses and found the best price on Walgreens.com.
I went through my ebates account for a 3.5% rebate and used the coupon code SIGHT20 (I think that was the code but it was right on the Walgreens site so easily found and even though it said it expired Dec. 31, I used it tonight, no problem and saved an extra $50!!!).
I paid $27/box after the 20% discount, plus, I'll be getting about $7 back through ebates. The next best price I saw was Costco for $28/box.
1800 contacts was the highest price.
If your contacts are carried by drugstore.com (I think this is visiondirect.com), you get a 12.5% rebate from ebates plus their prices were good. And, they had random coupon codes floating around but they are pretty strict about who can use those codes and the site didn't accept any code I entered from Retailmenot or other sites.