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Amazon.com has TERRO T382 Fly Magnet Replacement Bait – 2 Fly Magnet Trap Attractants for $4.99.
Shipping is free with Prime or on $35+ orders.

About this item[list][*]Replacement Bait – This bait is designed for use with the T380 TERRO Fly Magnet Reusable Fly Trap[*]Attract & Trap Flies – When mixed with water, the bait creates a scent that is irresistible to flies. Once inside the compatible trap they can’t escape[*]Easy to Use – Simply add the bait to your Fly Magnet Trap, then add water to the trap’s fill line