A lot of universities have them, so if there is one near you then you could see if a student would do it for a six pack of beer.
If you want to buy your own you can usually pick a used one up on ebay for under $1,000 (USD), but you will also need a scrubbing exhaust system ($5,000 + USD) to handle some of the nasties that burn off from organics like dioxin, chlorine, carbon dioxide, and carbon monoxide. Or wait a few years and there will be a table top version that costs less than $1,000 new.

Another cheap option is take your pattern to a screen printer (T-shirt maker) and let them screen your patterns on. I often do this circuit boards that I make so they will be neatly labeled.