1. Get Social

There's one really easy way to stay up-to-date on the latest sales, rebates and promotions: follow LensDiscounters on their social media pages, where they post regular updates on special deals.

2. Get Free Shipping

Customers who put more than $99 worth of stuff in their carts are eligible for free shipping. Every order under $99 ships for a low flat rate of $5.95.

3. Dig Deep

It's a little hidden, but it's worth finding -- scroll down to the bottom of the page. In the footer is a small link for "Promotions." On that page are coupons, special vouchers and instant rebate offers.