I made these training plates a few years ago as a way of getting the Olympic bar to the proper height for deadlifts, cleans etc. but without putting any weight on the bar - especially when training new clients.
Simply get a piece of plywood, draw around the outside a full size Olympic plate and the centre hole, use a jigsaw to cut it out and you have a very cheap but very effective set of training plates.
Some more sand bags for training and also building trestles that are used as squat stands. My friend Busters uses this kit in his hobo gym. Trestles offer a cheaper option to squat stands or racks, and can be bought from most builders merchants. Check the following links for some suppliers