Senior director of marketing at Bethel Music, Bethel Church, Bethel TV and WorshipU. I lead the marketing team for one of the fastest growing indie music labels in the world. I have worked with Mark Cuban & won prestigious SEO award. Expert in leadership, culture, growth hacking, and all things marketing. In addition to marketing, I will consult on team structure, creative / design, I have a background in technology and was a partner at a web design agency. I have worked with Mark Cuban, and have won a prestigious SEO award in 2011. I have worked in marketing for the past decade.
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. firstname.lastname@example.org