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Fusor
A fusor is a vaccum device sort of like a vacuum tube. In fact, vacuum tube research gave birth to this device. These have been around since the 1950s, but their design has been much simplified to a two grid system used today. Basically, an inner and outter metal grid is constructed in a vacuum chamber. Pressure is in the order of a thousandth of a torr(our atmosphere has a pressure of 760 torr). A negative potential of several kilo volts is applied to the center grid. It then creates a sort of plasma ball in the center if all goes well.
If you wish to generate neutrons or protons, the device can be designed to do so. First of all, it must be able to withstand greater vacuum levels than where necessary for the initial fusor design. Second, you need a source of deuterium gas. Although ideally supplied throuh a lecture botttle, you wouldn't need very much at all so electrolyising a small amount of heavy water could do the trick. When you run the fusor now(at higher voltages due to higher vacuum), you should be emitting neutrons and protons.
The most expensive part of this is probably the heavy water. Price wouldn't be too bad if you are a good scrounger and are just trying to make a basic fusor. At the very least, if you can get the actual vacuum chamber, everything else will only be small costs, so you would be able to afford it over a long run. Even if you can't find a good deal on the chamber, platic ones can be gotten without too much cost. And now with Ebay in the picture, there is always one good scrounging option open to almost everyone.