5 pairs I think, although they have different coloured glass in them. I know I keep one pair in each of our 2 cars and have one pair that I wear a lot. Then I have a few more.....
I love sunglasses. I have one pair of Channel, my best friend bought these for me for my Bday, one pair of black Gucci, DH bought these for Valentine's Day and a pair of inexpensive ones that I bought for myself.
I've got 3 pairs of sunglasses ... 2 pairs of (replica) Oakley M-frames, and 1 pair that I picked up at a grocery store when I couldn't find the others during a move.
I only like Serengetis, so I can't afford a bunch. I wear a new pair that I buy maybe every two years and keep the old pair as a back up, and for parks, pool, lake, etc.
I have pairs. One that has a scratch on one lens and it drives me nuts, so they are my back up pair. The other one's nose cushion thingy just broke the other day, now I need a new pair!
I have one pair of Oakley Jackets. I love them because they came with interchangeable lenses. They are 3 years old and to me worth every penny DH spent on them. I wear them every time I leave the house, the sun kills my eyes.