Unless you just want to spend money, build your own.. I take a couple of replacement broom handles from the local hardware/farm store (5/8") for $3 each and attach them together with a carriage bolt and lock nut, paint them with camo paint and pad where the rifle stock sits...
That way, they are set for my personal height, with me sitting on my little Turkey seat...
They are strong, very stable, and double as a walking stick, if I need it at times...I've tried some of the light commercial sticks and they generally are too flimsy and flexible when I put the weight of the rifle on them...