Honestly, most of the time I see something like a massage or something that isn't a physical item that I'm buying I will check from Wowcher or Groupon see the price, call that business and say I saw them on whichever one and see if they offer the same price as then the business especially if it's a smaller non chain business that's just trying to get it's name out there. And while charging less overall, for something that the business if good enough may make a repeat customer out of you or even if not doesn't they don't also get 40%+ go to Wowcher or Groupon.