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

Visually does a pretty good job, their prices start at $1000 per infographic - market.visual.ly.
If you are tight in budget, you can use services like PicktoChart.com where they give you predefined templates and icons, with a monthly subscription around $20 per months.
There are also design agencies like ColumnFive and KillerInfographics, who might do it.

Hi Please give more details

Hi there, I think I may be able to help.

I've been designing infographics for organizations, publishers, and for my own company's content marketing for about three years. I just launched a site aimed at offering affordable infographic design that might interest you: http://www.thepowerofinfographics.com/

The site shares some infographic ideas, includes a small portfolio, and has some information about my book, The Power of Infographics.

If you're interested in chatting about your infographic objectives or have any questions at all, please feel free to contact me at your convenience.

If you have the information needed for the infographic, one of the things we have done is hire a few people from Fiverr to do one. This quickly and inexpensively gives us ideas about what we like and also allows us to test it - see how people respond. Then you can go for the greater expense of having it done high res or print quality.

Hi! Not sure if you are still looking for a great person for this... I would recommend
Jeremie Lederman of Lederman studios

602 432 0305

He does infographics for large companies but his fees and service is the best! One of the highly respected commercial illustrators of our days

I live in India, and there are many infographics designers in India. Most of them are freelancers. You can find them on any popular job portal, but here a small list of infographics designers. I hope it will help you. Do talk to them and see if you can work out something.
Here is the link: https://www.truelancer.com/infographics-freelancers-in-india
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath