I know how awful it is to be without equipment funding, especially if your uni can't or won't help. Firstly, ask other departments in your university - you might find the equipment in the most unlikely place. I've borrowed lots of equipment that is ESSENTIAL for my research from e.eng. and physics departments in my university (I'm a chemist). People are usually VERY generous. Can you tell me what it is you need? Secondly, try e-bay! Seriously, an academic gave me this tip, and I found what I was looking for at ~£60, usual cost