I often browse eBay for cheap polishes when I can't sleep. I'm not sure why but it seems as soon as I buy something I doze off quite easily! lol. A polish I recently picked up is Cover Girl's Mystic Peacock a stunning teal shimmer. I don't know what year this polish came out or when it was discontinued but the bottle I received applied perfectly in 2 coats and dried to a smooth glossy finish. It reminds me of OPI's Cuckoo For this Color but with much more depth.
I highly recommend picking this polish up if you haven't got it already as you will not be disappointed! You can get it for £2 or less on eBay!