I work in marketing and have printed my own brouchures plenty of times. Depending on what you need them for, the cost can vary greatly. If it's for personal use or something small like a church cookout, just build them yourself in Word and print them through your own computer for free. If you need them professionally done (for instance, promoting a new business), hire a freelance graphic designer to do it for 100 bucks and then call around to a bunch of print shops to get quotes. The prices will change based on paper and the amount of color you use. The cheapest option for 100 prints should be minimal.