You might get an old EPROM programmer at a Radio rally/hamfest. But they're often not that cheap. How about buildign one for your next project - to program standard EPROMs (2764s - 27512s, say) is not that hard. Basically you have to set up the address and data, take one of the pins (Vpp) up to 12.5V (or 21V, or even 25V on older devices) and then apply a 50ms program pulse to another pin. And repeat for all the locations you want to program.

When i built my first embedded control system I had to build an EPROM programmer first....