Find a friend that has build computers, get together with him/her and buy some parts (plenty of suggestions here) and put the thing together. There is just a bit too much of a mark-up on gaming systems from OEM vendors vs buying parts. Only catch is that you have to buy a license of Windows that most builds don't account for, that adds about 100 to the cost.
The other side of that, is that some people that say they can help you, will make things worse LOL I just fixed a PC a friend of my son's friend "built" with help from another kid, it was not booting. When I took it apart I found that the CPU was not in the socket, the heatsink was not tightened down (actually that probably saved the CPU from being totally destroyed LOL), hard...