I believe that most come with two these days, but I feel that three is about the bare minimum. The LCP only came with one! I understand wanting to offer the pistols for lower prices and that means not including magazines, but the cost of making them for the manufacturer is negligible and I don't buy any excuse to exclude them in a pistol box. If you're buying a 1911 or something then no big deal, but proprietary magazines should be included!!!
Not including magazines isn't a deal breaker for me, but the value for including them goes up exponentially in my eyes. For instance, if it's a gun built for duty, they should get you up and ready to go with three mags in the box.