Harris is the only bipod worth buying.
yes, some bipods are cheaper, slimmer or have less bulky designs, but thats because they are flimsy POSs.
when i bought my first bipod, i immediately shelled out for a Harris swivel even though they were $140ish at the time here in Canada. my friends all cheaped out and bought $40-50 bipods. ive seen each of them replace their bipods 2-3 times either because parts were breaking on them or they got wobbly/loose after awhile. other friends told me that buying the swivel model was 'a waste of money, what do you need that for?'. well, guess what - theyre all upgrading to swivel versions too after shooting my guns.
i have a couple other Harrises now, but that first one i bought is working just as well as when i first picked it up, and its taken a hell of a beating since then. do it right the first time and buy a good bipod, IMO.