Hello, Try this store for ear plugs http://www.earo.co.uk  

you can get custom mold earplugs. They are like a putty and you mold them in your ear and you wait 15-30 mins for them to set. you can get them in a hardware store near earmuffs or in the drug store with the swimming equipment like goggles. Hope I helped :)

I found the best way to keep out the ambient noise at night is to sleep listening to and mp3 player wearing earbuds. Works much better for me. My inner ear noise was as loud as the noise I was trying to block.

the disposable ones that gunmen, machinist, flight crew and sleepers all over the world use I use them and they work great but I also think if flight crew use these and only a small amount of flight crew go deaf in their lifetime. Sleep on that one (with ear plugs of course)

I use the HP - 02 Live In ear headphones. Almost no background sound and prestine sound quality. They are also really cheap!
Hopw this helped,
Flannel UK

I would use expanding foam like these.

http://www.britishsnoring.co.uk/shop/snore_calm_foam_ear_plugs_special_offer_30_pairs.php

or

http://www.latoplast.com/latoplast-products/hearing-protection/ear-plugs/3m-ear-plugs/corded-expandable-foam-ear-plug-029-1110

They are comfortable and durable up to a point and then can be replaced as they are very cheap and come in packs of 30+.