Check your cash back when using the HD automated check-out facility and paying the bill with hard cash!
So far I have "collected" $5 and $2 at two different HD stores in FL where previous customers would have been confused or overwhelmed by the "talking computer" and "put items on the scale" and "take your items" etc!
I'm not "fingering" return slots at public telephones but I may get that habit while doing my (weekly) shopping run at a HD.....could pay for the gas...!!