There are definitely some killer deals out there on used Mirages. I only bought my 2015 new because the huge rebates at the time allowed me to get a 'loaded' one for $10k. The current rebates aren't at that level.
Just be careful in the used market because it seems like there are a lot of salvage title Mirages out there. There's nothing necessarily bad about a salvage title Mirage if you know why it has a branded title and it's discounted significantly. The used retail value on these cars is so low (and the cost of replacement parts so high), even a minor fender bender can end up totaling a 2 year old Mirage. That's a bummer, but it means more cheap used parts for the rest of us.
Just remember many institutions won't finance a salvage title car, it won't have any warranty, and any car with a branded title is hard/impossible to sell. My biggest beef with the salvage title Mirages I see for sale is that many are barely discounted from the retail price of a Mirage with a clean title?!?