I am a big fun of Rayban as well. I always buy from this site...
Make sure you examine any kind of on the internet purchasing support. I believe you receive the very best 1 that you want the majority of.
buying service
Please check any online buying service. I think you get the best one that you like most.
There are many website where you can buy the Mint one, The most popular sites are Ebay Amazon. Which i think you may have check it. the Next cheap and best place is aliexpress. They are Chinese website but have some quality product.Do check review of seller before placing order.
Have you tried forever 21 or H&M? Or this one by "knockaround" they look similar to a rayband and I like its neon-mint color.
Claire's
Try eBay