Another option you might think about.Is building the tank yourself.All it takes in some 3/4 plywood covered and sealed with fiberglass and a pane of glass for the front.There are 3-380 gallon tanks at the store I help at,that are built that way.And the most expensive part is the glass.
They built my customer turtle tank for me and I LOVE it. They are super friendly and very willing to work with you. Plus if you have them deliver it to one of the shows that they attend regularly (they travel all over the place) then I don't believe there is a shipping cost. :twocents:
A glass tank will run you about 1/2 the cost of an acrylic tank.