 Checkbook found the best prices for contacts online, but you still need to shop around. Some well-known online sellers, such as 1-800-CONTACTS, offered prices that were higher than those offered by some local outlets. The lowest online prices we found were offered by Lens.com. Here's one more tip. All eye doctors are required by law to provide their patients with their vision prescriptions for glasses or contact lenses without being asked. That makes it clear that you don't have to buy from them.