For a variety of reasons, I don't particularly like Kmart. Or more accurately, I particularly don't like Kmart. But that's probably the wrong way to start a post telling you how to get a good deal there. :-)
There are two things that I love about Kmart, and that's what keeps me making an occasional trip there.
First, I like that they post coupon tearpads with products. I am sometimes able to find coupons there that I'll later use at Walgreens or another store for a good deal.
Second, sometimes they have steals in their blue-light specials. A while back I found a 6-pack of Ensure for $.86. It was an item I shop for anyway, so I picked it up. When I checked out, the machine printed a Catalina for $1 off any Kmart purchase. I wasn't expecting it to be a money-maker!
Kmart doesn't offer the nicest presentation I've ever seen, but the flipside is that the older merchandise looks, the cheaper it seems to be. Last night I came upon a blue light stand in a corner of the store that appeared it had been deserted. A long time ago. There were several bruised-looking packages of ladies' underwear, marked down to $3.50. I put one in my cart, and when I passed the price checker, I scanned it. $.90 for a six-pack. Score! All told I paid $.18 a pair for the package.
It pays to look for abused merchandise--and to see out those weird blue-highlighted display tables. :-)