For budgeting I would use $75 as a cost for a controller with no case and no cords. A CG1500 will run you about $15 plus shipping, Output cords can be had for a $1 at the dollar stores, slightly higher at Walmart or Home Depot. A single power input cord can be anywhere from free to $10 depending on where you get them. In any case unless you buy it used you will have a little work to put it all together before you can use it. Cases and cords are never in a coop, only the controllers themselves.
Hope that helps.