So Miami: Where are the Flip Flops?

I really should learn from my experience and stock up on flip flops in the summer.  Because even though we wear shorts and flip flops year round, it never fails that the retailers stock up on things like these:

There are racks and racks of sweaters and winter pjs and boots, but why?  We've had a significant cold front this week and never once have I thought I needed gloves.  But I do need flip flops for two of the kids and the only ones left are too big or have some other unwearable flaw (some of us need fashionable flip flops!)