More of a heads-up than a sale notification. I asked my local Lowes (i'm in the states btw) out of curiosity if they would take competitors coupons on items.
After speaking with the manager for a minute, they said they would allow it one time for me.
They accepted a 25% off anything harbor freight coupon.
After it was all said and done it was 30% a $599 table saw; so it came out just around $450. Lowes card took off another 5%.
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The person that told me about this said Home depot used to do this as well, so may be worth a shot just to ask on any next big purchase.