I think its a good idea, just hang around and stalk the different sections that you like. You want a woman with a healthy lifestyle just hang around the fruit and veg dept. You want a party animal, just hang around the off licence and party pieces sections. You want a nice quiet person hang around the DVD or book selections.
You want a sexually adventurous person, just hang around the place that has bumper pack condomns and KY jelly (its nearly allways sold out in Mallow!)

I can honestly say I've never considered the supermarket a place to pick up men as any that I see are always with partners

be a nightmare if they'd run out of trolleys when you got there and you had to use a basket

....definitely less competition than in a nightclub!