for small parts, I would search the local craigs list for a used stove/oven combo. You should be able to pick it up for less than 50 bucks. This will allow you to start on your powdercoating and then you will have a much better idea as to what you want to move up to.
For 2K, you could purchase quite a few ovens. I question on if those lights would get your piece hot enough. It's not the infrared that cures the powder, its baking it. Those lights are for curing paint on automobiles, not for cooking.
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