I think three established plants for $40 is a great price; I would certainly buy three.
As far as a trellis, I truly believe anderj's design is great...
Here is the basic idea: (you can definitely modify anderj's to fit your needs/area) basically buy some chain link fence vertical posts and horizontal posts. Drive the wider piece into the ground, remove and empty dirt, put back into ground. Connect the thinner pieces together for your desired height, and then slide into your pole in the ground.
Trinke Das Bier Das Du Gebraut Hast