I recently bought 2 Champions at the gun shop for $39.95 each, seem about as good as Harris but a few oz lighter - I've been working one out regularly since with no ill effects from deliberate abuse - I think I can live with the cheaper version ...
I'm also gonna try a "new invention" I thought of - Home Depot and some other retailers sell an orange "tie" about 20" +/- with some kind of mallible wire inside, I've wrapped one around one walking stick just below the grip, after a little practice I can fabricate a solid bipod in about 10-15 seconds that rivals most bipods or shooting sticks - right there when needed and nothin' hanging on the rifle
The Harris is your best bet for attaching to a sling stud. I recommend the swivel version with the notched legs.