You can probably get a good set made to your specs for under $100.
I had these made of chrome molly, just followed the specs from a sight I found on bracing the VMax for racing..
What cost me the most was having it powder coated silver, and the welding since I did not have the equipment to weld.
The shop provided and cut all the material, and welded it pretty affordable but then I powdercoated it then had to pay some one $75 to weld the tab to the frame...cost me a total of about $160....if you know a welder who works for beer, it'll cost under $80...but this was 3 years ago, prices for material may have gone up.
Thought about the bolt ons, but all the bolt ons do not tie the frame together at the right angles, because the perfect spot is at a junction on the frame that cannot be bolted on too.
My Max would start dancing under power changing lanes, and the dreaded weave came on at the worst times at high speeds.
With the brace added, on the same high speed sweeper (for the Max) I picked up about 15mph...from 75 to 85/90mph.
And immediately I was hitting 145mph like I was on rails...on a good calm day I hit 155 on the speedo......my speedo is off 4mph at 60 per GPS.
I'll try and find the site and post it up.