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Woot.com [woot.com] has 24-Pack 1.1oz 24 Spike Packs (576 Total Count) Miracle- Indoor Plant Food Spikes for $ 19.99 (.83 per pack). Shipping is $ 6 or free w/ Prime.
To get the deal:
Install the Woot app from either the App Store [apple.com] or Google Play [google.com].