No such thing as a sturdy but inexpensive bipod. The cheapest your going to get into would be a Caldwell or Shooters Ridge, both are Harris "clones" the Caldwell's aren't as well made as the SR which are exact clones of the Harris and are all steel. You would also need a bipod to 1913 adapter. You are looking at $70/$80 for the bipod and another $20 or so for a cheap rail adapter.