I agree that the cost of the marker should NOT include the shipping price as the spirit and intent of the rule is to find a marker in that range and shouldn't take into account it was shipped from Iceland for $45.
I am in the same boat as Millar156 in that I lucked out for $20 on an old shoebox Impulse that has more leaks than Edward Snowden.
I also feel that not including shipping on ordered parts is in line with the intent of the contest...but I leave that decision to the contest organizers. I just can't wait to see what everyone brings to the party. I may end up blowing my budget on a solenoid and duct tape.