These are some items you might buy on Ebay auctions:

Bike Bell Yellow sounds helmet Bicycle Alarm Horns
280470231180 0 4x Bike Bell Sounds Helmet Bicycle Alarm Horns US $0.01 (0 Bid)
End Date: Thursday Feb-25-2010 17:12:15 PST
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4x Bike Bell sounds helmet Bicycle Alarm Horns
270537259753 0 4x Bike Bell Sounds Helmet Bicycle Alarm Horns US $0.01 (1 Bid)
End Date: Thursday Feb-25-2010 17:12:18 PST
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logo 4x Bike Bell Sounds Helmet Bicycle Alarm Horns
6LED 4Sounds Bicycle Horn Bell Police Car Light Trumpet
6LED 4Sounds Bicycle Horn Bell Police Car Light Trumpet
Paypal   US $.99
Schwinn Bicycle Horn
Schwinn Bicycle Horn
Paypal   US $.99
VINTAGE BICYCLE HORN
VINTAGE BICYCLE HORN
Paypal   US $5.00
NEW Chrome Retro Style Bike Bicycle Air Horn Loud new
NEW Chrome Retro Style Bike Bicycle Air Horn Loud new
Paypal   US $4.99
lot vintage bicycle delta seiss horn headlight light
lot vintage bicycle delta seiss horn headlight light
Paypal   US $1,100.00
Bicycle 8 Tone Horn Turn Signal LED Brake Tail Light
Bicycle 8 Tone Horn Turn Signal LED Brake Tail Light
Paypal   US $.99