You can do even more preparation for the summer with a visit to Giant Vintage, a huge online store containing sunglasses from the 70's, 80's and 90's alongside some retro inspired frames.
The designs run the whole range from the subtle and more contemporary looking to some outlandish novelty numbers. For example, it may be totally the wrong season, but can you resist a pair of Christmas sunglasses complete with holly and ivy patterned frames? Pictured here is a pair called 'Woosh Orange' which would be perfect for imitating the sixties space age look for $20.
Prices in general are a maximum of about $30, although customers outside North America will have to calculate on additional shipping fees.
See the Giant Vintage website