Go to the shop that sells accessaries to look for. These stores always have some nice accessaries, such as ,sunglasses and other small things. You may find them at that kind of place. Or go to search online ,you will find many nice sunglasses.
I understand your feeling of looking for lime green sunglasses. I also like it. I tried to search it out. And finally i search it out at amazon.com. And i find the sunglasses at amazon.com are very affordable. So, if you want lime green sunglasses, Just search it at amazon.com. I believe you can find what you want at less amount of money.