This is probably a pretty niche item, but I grabbed one and figured there might be someone else there interested.
I have ComEd for my electric company, and they have their own store - https://www.comedmarketplace.com
- where you get discounts on thermostats and such. I just got the $250 retail third-gen Nest for $150 plus tax. Just had to enter my address to validate ComEd service at the location. I think some other companies provide this as well - I know ComEd services a lot of people.
If you're in the market for one of these, worth looking at rebates based on which companies you use for utilities, insurance, etc.