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They are virtually endless, you have to have an idea of what you want to get from your hot tub. Some people want really fancy stuff and super powerful pumps and they will pay 9-15k for it. Most people want moderate jet pressure and minimum bells and whistles, typically you should be able to get into a decent tub of good quality for 6-9k. It all comes down to what features matter to you. Your local hot tub company should be able to break it down for you and find something that you like within your price range.
If you do have any questions feels free to ask.