What is the easiest way to cut make aluminum gusset

[lamk]

Our robot this year was mainly make of plywood, masonite and hockeystick. We did some welding and bend some steel to support our main aluminum column. Everything was bolted together.
It was a simple and effective robot and it got us to St. Louise.
In order to prepare for next year we would like to start building superstructure using extruded aluminum tube and rivets. We can certainly buy pre made gusset by vexpro but because we are in Canada, shipping cost and time is an issue. Vexpro Canada is out of stock a lot of the time. I have access to a CNC machine shop but I only want to bother them with the big ticket item. What is the easiest way to make/ cut your own .09" thickness aluminum gusset for a school with minimal resource. I can invest in some new tools if they are less than 1K. The school have a lot of equipment but they are all wood working machine thus the plywood masonite robot.