Look into Emerald and Beachcomber. They have various size spas at different price points.
The dealer I went to quoted prices for the Emerald 899 series at $4500 for the basic and I think $5300 for the classic. The 899 is a huge 7 or 8 person tub without a lounger. The 899 is their largest tub so anything smaller should be less expensive, I would think.
If you go on-line they have the specs to see if there is a tub that you may like. Their at emeraldspa.com. They seem to be rated highly by people who own them.
One drawback is that they don't have a large dealer network so their closest dealer to you may be a distance. The one I visited was a little over a hour away, when I asked if it was a problem - his answer was no.
I saw the Beachcomber at a different dealer. They have a 300, 500 and 700 series. Unfortunately the dealer that I went to was brand new to Beachcomber and he didn't have his display set up yet so I didn't get too many prices. The one price I got was on the 580 and I think it was $5600. The 580 is Beachcomber's largest 1 pump tub, again a smaller tub should cost less. Their at beachcomberhottubs.com. They also seem to be rated highly by people who own them.
I've been to many dealers looking at different brands. In my opinion, I have found that these 2 brands represent a good value. I plan on buying one in the spring and it is between these brands.
I hope this helps!