Any of the great shops in the area can get you set up. They're pretty easy to find. Anything from all-in-ones to built in overflows, etc. Where are you located?
Yes, suggest you go through a local shop to order them.
That can really help if something goes wrong with the tank or shipping.
There is usually very little markup.
Most of the good shops aren't in the city. In the East Bay about 30 minutes from you check Diablo Corals. There's almost no markup on the tanks and much of the equipment. Jess can help you find the right tank and it will be warrantied.