The brackets are made by a few people and cost around $250.00 and up, depending on who made them. Sometimes you can find them cheaper when you buy at least 10 of them at a time.
Putting the tubes in and collimating them is the hardest part.
When I can find the Bushnell Spacemaster tubes (they don't make the same style we used in the past) and the "correct" eyepieces (22X wide angle) the whole outfit ready to use, costs $750.00 new. I was selling them for $695.00 but, the eyepiece price and older tubes went up in price.
You would need two Spacemaster 60mm tubes, two 22X wide angle eyepieces, the bracket and know how to collimate them.
You would probably have $700.00 to $750.00 in them if you did it yourself.
Later
DC