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my dh goes to target and has been quite happy with their service. prices are pretty decent also.

I have worked at a Walmart Vision Center and a for a Private Practice doctor.  Walmart in my opinion is your best bet when it comes to cost and service.  You can get the same service with out the cost.  In fact I saw many people pay more just to use there vision insurance when they could have gone to Walmart and received the same contacts and service for less.  Just so you know a lot of the frames offered at Walmart are made by the same manufacture that you would get at a Private Practice.  For example Walmart's "No Boundaries" could be made by the same company that puts out a fashion frame such as Armani, Guess, DKNY, Calvin Klein, etc.  Walmart also tries to stay pretty competitive with it's prices.  If you don't feel comfortable with a contact the doctor has tried on you let him know.  A lot of times people have to try several brands of contacts just to get the right fit and feel.  I wear a different brand in each eye because of the clarity and comfort of one brand works in one eye but not the other.   I hope this helps.  If you have any other questions about the differences I would be happy to help.