FOAM VS. CONCRETE - Fence Post Setting Test. This may be one of the coolest products reviewed yet! 

If you are going to be setting a deck/fence post and just don't feel like mixing concrete, check out this fence setting foam from Sika.
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Sika Fence Post Mix homedepot.sjv....
Sika Fence Post Mix is a 2-component, pre-proportioned polyurethane resin. It is mixed in the bag to produce expanding foam for supporting and backfilling fence, mail box, gate and signage posts. Suitable for all types of posts including wood, steel and PVC.
Lightweight pouch replaces two 50 lbs. bags of post mix
Fast setting
High strength
No water or special tools needed
Simple and fast application
VOC compliant in all 50-states