Any suggestions on a reasonably priced hydraulic transom jack for 3rd Mercury 300x?

Bob's machine shop makes some nice ones that would raise all 3
Together.
Not cheap but would be the best way to go.

Its very hard to raise 3 , 1 at a time.
My 2 cents

I was looking for something like that but never found one. Do you have to call because I dont see it on his website.

I would call him for sure,
Got a qoute last year, i was going to do the same on my awesomecat.

I think it was about $6000.00 ??
Once jack plate that would raise all 3 together,
Costly, bit would be a good way to go,,