If you are looking for some deep discounts and not too particular on exactly the style or product you are looking for, I highly recommend checking out some of the Habitat for Humanity Restore locations with an open mind and a tape measure! You can find a location local to you at this link .
I was able to do 3 kitchen and 3 bathroom glazed mosaic backsplashes for $1.50 per 12" x 12" sheet. I bought all 30 sheets they had and found the exact same product at menards for over $6.00 per sheet, pretty awesome deal!
Sometimes you may not find what you are looking for as their inventories are always changing, but typically it is a great place to get very cheap doors, flooring, light fixtures, trim, even appliances and furniture. I can say from experience that the Aurora location at Fox Valley Mall is one of the largest I've been to and usually always has a great selection. These places are a bargain/treasure hunter's paradise and your purchases go towards helping Habitat do good in the community.
I know this is no secret, but Menards 11% off everything has been going on for months now since COVID and can get you a good amount of money back if you are diligent about sending in your rebates (it is worth the 5 minutes it takes to fill out and put in an envelope, despite the complaints that you will hear so often about how much of a pain it is).
Good luck with your BRRRR!