GPU mining rig build assistance

I am looking for someone to assist with building a GPU mining rig. I do not want to over pay for grafix cards that should be about $300 each that are $2000 now. I am looking for someone to build a GPU mining rig for me that can have a ROI within 5 months. I do not care what crypto it mines just that it is good at what it does. I can even offer some type of bonus for the person that helps me with this in the form of a percentage of the mining profits in BTC or whatever currency we would like. If you can source GPU video cards cheep you are the person who I am looking for. Please apply and lets get this started..