The best replacement for bipod is shooting sticks.

The best alternatives to bipod are rated as following:
★★★★★  shooting sticks
★★★  sandbags
★★  tripod
★★  no bipod
★★  shooting bag
★★  grip pod
★  straight pull bolt
★  sandbag
★  shooting rest
★  monopod
★  sling
★  bags
★  benchrest
★  foregrip
★  foregrip bf3
  tripod shooting
  gg&g
  harris
  harris bipod
  gun rest
  sand bags
  caldwell
  blackhawk

Your alternative for bipod is not listed? Suggest!
Speaking about bipod, one probably shouldn't forget about sling.

Other search terms related to bipod and their ratings are:
★★★★★ sling
★★★★★ grip
★★★★★ foregrip
You have in mind a companion for bipod and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of bipod in all years. Click on graph for more.
bipod
shooting sticks
sandbags