Menards is a Midwest staple: The Wisconsin-based chain, known for its ​“Save BIG Money” slogan, is the nation’s third-largest home-improvement retail brand, behind Home Depot and Lowe’s. But in Illinois, it’s slowly becoming more than just a place for folks to pick up ceiling hooks and gardening gloves, as developers eye the big-box store as a promising spot to build public EV chargers.