I think the answer to your question is multi-layered. Here are a few things to consider.

#1: Do you want a company to conduct the research for you? Market research and demographic-studies are expensive. There's no way around that. However, you can do the research yourself and you'll save a lot of money.

#2: Do you want the design to be a standard "top down" graphic with pie charts and trend-lines? If you want that, you'll be able to find a lot of inexpensive designers. If you want something more custom, you'll have to pay for it.

#3: Do you want an experienced designer or someone from 99 designs? Either way is fine, you'll just "pay for it" either with your time (looking through 98 bad designs, and working with 1 good ensign to try to make it better) or with your budget.

While "cheap fast work" isn't always the best, I can connect you with a designer who can do a good infographic for around $500. It's up to you. Feel free to ask me for a personal reference if you'd like to get in touch. bryant@withnoble.com