unfortunetly i cannot help you anytime soon due to work, however anything less than 1.5" thickness shouldn't be too hard to do. It woudl simply be a matter of drawing it up on solidworks and taking it to the waterjet.
The cost any one off pieces are what drives most people away. It is almost the same price to make 40 of the same pieces than just 1, excluding the cost of material.
As for price, i do not know just yet. i would have to organize something with the boys.
I would honestly reccomend you look around locally at machine shops, or try to make something at home by yourself. You are only using up your time, and you will learn alot, regardless of the outcome.
Adrian