Are you a larger person or a smaller person?
If you are a mid size to larger person or will shoot on potentially uneven ground prone and you want to go with a Harris i’d Recommend the Harris HBLMS, or a 9-13” bipod with notched legs and a swivel (for leveling the rifle to the ground on uneven surfaces)
If you are shooting off a bench primarily or are just smaller (5’ 9” or less and skinny) and want to go with a Harris i’d Recommend the HBRMS or a 6-9” bipod with notched legs and a swivel head
With that said, for square range shooting i’d Recommend what
@Nature Boy said, but you asked about the Harris webpage so I spoke primarily about Harris bipods
There are many, many options, but the cheapest i’d Recommend is for a Harris, the cheaper ones are either Chinese copies of a us company or they are an imitation that will not serve you well
From cheapest to most expensive:
Harris $100 as recommended
Magpul (maybe) $100
Sinclair F class bipod. $200
Atlas CAL $250
Atlas PSR $350
TBAC bipod($400+)
MDT Ckye-Pod ($500+)
Elite iron revolution ($500+)