Free: Contests & Raffles.
I use a Bog Pod which has three legs. I can shoot better offhand than I can with a free standing monopod or freestanding bipod.
Another good alternative if you aren't carrying sticks is to use your trekking poles and cross them and rest off of that. I've used sticks in the past and loved them but most of the hunting I do now I like trekking poles for the terrain.
I carry shooting sticks 90 percent of the time with deer. I just have a cheap Cabelas brand that works well and are light. They are full extended as I am hunting and although no one else I generally associate with use them I find them extremely useful. Although I have been using them well over a decade most recently for 2015 and 2014 deer under a hundred yards and even at that short distance I still found them very pleasant to use. Countless times I will rest the rifle on the sticks while I use the scope to glass the critters. I started doing this when I realized I was missing some opportunities going to binos then to scope. Although I do not use them for elk as they tend to get in the way since I am on the move so much more covering ground. The deer however since movement is so slow and methodical I have come to really enjoy the sticks and don't find them getting in the way whatsoever.
I really like the attached bi-pod vs shooting sticks. It is quick to drop to a knee and they also work sitting and prone depending on the angle.