Redwing does an annual October warehouse sale, my first pair were factory seconds that were 70% off. I'm not sure if they have online offerings or if it's only at the physical warehouse. The pandemic kinda changed it a bit. You'll see lots of folks scalping them on eBay.

Edit: Also a disclaimer that I think Redwings too are going down in quality. Iirc some goodyear welt sneakerheads found that they've down graded from leather, then cork and now paper in the construction of the soles.