I agree with G. The Carry Lite that he posted is pretty realistic looking. The other decoy I would consider the best is Mothwing’s Bob’n head decoy. The tail and head moves in the slightest breeze. Sometimes those does can clear a field because they don’t feel comfy around a decoy. I have noticed even the slightest movement in the decoy keeps those does a little less wary.
I think you would be hard pressed to find a good decoy for under $100. The Carry Lite is about $150 and the Bob’n Head I paid $179.99.