A roto-tilt/pivoting type is more versatile. A B-Square brand will run ~ $35 and aren't bad but only go from 9"- 20" which is low for a sitting position, at least for myself. Stoney Points aren't bad and only slightly more expensive and come in different heights. Love Harris bipods but they start around $100, well worth it to me.
First it rained, then it blew, then it frizz, then it snew --- from an oldtimers gunning boat ~~ He understood what it's about!