On lower quantities though with the right purchase printer wise it can be more economical for you to do it your self. Eg. If you are doing a run of say 1000 pages here printer will charge around $0.10AUD per page, where as you can print it yourself on a decent laser printer cheaper.

Just make sure you take into account machine costs and consumables costs as well, when working out which is cheaper. I would hazard a guess anything above 2500 pages at a time will be cheaper at a printer though.