AR-15 Purchasing Help.?

I'm thinking of purchasing an AR-15. I live in IL. and I have my FOID Card. But I don't know the procedure of getting my hands on an AR-15. Also I don't know which company to buy from. My budget is around $1,000.00 I don't need the best gun out there. But I want a solid gun to start with that I... show more I'm thinking of purchasing an AR-15. I live in IL. and I have my FOID Card. But I don't know the procedure of getting my hands on an AR-15. Also I don't know which company to buy from. My budget is around $1,000.00 I don't need the best gun out there. But I want a solid gun to start with that I could upgrade over time if I feel I want to. I do want it to have a 20" barrel too. If anyone could help me out it would be much appreciated.
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