These are some items you might buy on Ebay auctions:

BICYCLE TURN SIGNAL Horn Light for Bike Minibike Gokart

US $24.96 (0 Bid) End Date: Friday Nov-27-2009 17:33:00 PST Buy It Now for only: US $29.99 Bid now | Buy it now | Add to watch list

4 Sounds Electronic Bicycle Bike Bell Siren Beeper Horn

US $6.99 (0 Bid) End Date: Friday Nov-27-2009 17:35:49 PST Bid now | Add to watch list

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Bicycle cycling bike mountain bike Electronic Horn Car Bell Trumpet 6 Sounds    US $.01

New Bike Bell sounds helmet Bicycle Alarm Horns Blue    US $.99

New Bike Bell sounds helmet Bicycle Alarm Horns Red    US $.99

Buy Pyramid Bicycle Squeeze Horn, Bugle, Chrome Plated at Amazon
No description for this product could be found, but have a look over at Amazon for reviews and other information.
Buy Pyramid Bicycle Squeeze Horn, Bugle, Chrome Plated at Amazon

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new 100 6LED 4Sounds Bicycle Horn Bell Police Car Ligh    US $1.10

New Bike Bell sounds helmet Bicycle Alarm Horns Blue    US $.99

New Bike Bell sounds helmet Bicycle Alarm Horns Red    US $.99