I originally got one of the variety packs from earplugs.gb. Very quick service but a touch pricey.
http://www.safetysupplies.co.uk/trolleyed/4/index.htm
do a variety pack with Max, Max Lite, Laser Lite, and Quiet which is somewhat better value (I think), and chances are that one of these will suit you.
I use the green Max Lite, but the Quiet ones are so easy to fit they may suit you.
The trick is getting a good fit. Practice with the "reaching over your head and pulling your ear outwards while trying to yawn" technique!