petfolio 20 pack bird spikes deterrent - 20ft pigeon deterrent for balcony. 3200 spikes to keep birds away. bird spikes for outside to keep birds away & deter swallows from nesting, squirrel deterrent gray 20 is up for auction in Patio, Lawn & Garden. The current bid is $1.00, 95% below the $19.99 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.