Do a search on the internet, I bought some from Sweden, especially for noise, made of 'clear' rubber so they are not very noticeable. -These ones came in a pouch to help keep them clean when not in use.
If you want to go el cheapo, look through the range of swimmers ear plugs, go to a variety of chemists and sports shops, there are some very light pink coloured/skin colour ones that are extremely hard to see, mainly as they fit a small way in the ear canal and sit flush on the outside rather than a sticky out bit to pull for removal. They are prone to falling out if you don't get them in correctly.
After being to a nightclub/pub etc without ear plugs, and your ears are ringing, its too late, that is a sign damage has been done.