Step 2: You Will Need
A hole punch (1/4" Diameter).
Some foam ear plugs (I used E-A-R classic).
Rubber ear tips of a suitable size for you ear.
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You could always try a shopping search on the mighty G.
UK
http://www.google.co.uk/search?q=ear+classic+earplug&hl=en&tbs=shop%3A1&aq=f
USA
http://www.google.com/search?q=ear+classic+earplug&hl=en&tbs=shop%3A1&aq=f