The common saying is "it is cheaper to do track days than get a speeding ticket" it is partially true once you have all the gear.
Cost of a speeding ticket is around 350 (in california) just for the ticket and not including the hike of insurance.
Cost of Trackday: 100-250.
Cost to get to trackday and back: $50.
The problem is getting the items for a trackday.
This was my cost.
Suit: 250 Altered for 150
Boots: 250
Gloves: 200
Back Protector: 50
Total:900
Nice to have:
Trailer:200+100 for a hitch
Generator: 240
Tire Warmers: 240
Front and Rear Stand: 100
The key is to find a local forum that does track days regularly and can fit your bike in their trailer.
In Southern California we have
So Cal Moto So Cal Motorcycle Forum , So Cal sportbike Forum, California sportbike forum, California motorcycle forum -Pretty much the hub of the track days.
OC MOTO - Portal -local to just orange county.
SoCalRidersForum.com - Portal -a newer forum that should work. LA+OC based and spreading out.
If you are unlucky and don't have a local forum then look on craigslist for a cheap trailer.

The car is a 2.4l 4 banger that has 0 trouble pulling the trailer even up hills. I get about 26mpg to the track. Though I need to find a 2in rise for the hitch.