I usea Bear River Crotch Stand and love it.Lightwieght and portable, I carry it with me most places I still hunt.When the need arises, I find a Y-crotched tree and go up.

They are not manufactured any longer so finding them can be difficult.I have 3 and will not part with them ,but they show up on ebayevery sooften and usually go for between $50-65. each. Bidding can get fierce, and they don't go cheap compared to what the original cost of $24.95 was.

This one is not mine and I don't have any affiliation with him/her. Just passing along a tip.
http://cgi.ebay.com/Bear-River-Crotc...QQcmdZViewItem