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Does the $20 off $100 purchase code of 153390 not still work? It's is supposed to be good through 12/31/2012. The $10 off $50 purchase code is 153391 with the same expiration. Should work for online orders, but I think you have to have a printed coupon to use it in a Northern B&M store.
I used them when I ordered my Kitchener 5# stuffer the other day. Three days after I ordered mine, they ran them on sale for $15 less and Northern credited me the difference. Ended up with the grinder for $69 ($20 off the $89 sale price with a pack of saw blades to get me over $100) and the stuffer for $59 ($10 off the $69 sale price). Plus free shipping if you have a local store to pick them up from (they did not stock the stuffer at my local store).
*UPDATE* I just tried the $20 code and it took it for me again, so it's still valid. I would assume the $10 code is also still good.