You can get all the equipment to make your own overhead unit at any good hardwear store, Home Depot, Lowe's, somewhere like that. It won't cost too much, the downside is you can't use an overhead on higher mesh screens and images with alot of fine detail. For that, you'll have to get the box unit, but an overhead should be fine to start with. Just make sure you get a good 500 watt uv bulb.
