Any competent weight control person can produce you one ... many organisations have them available OTS.
However, be VERY wary of taking something without adequate substantiation as the sheet has to be tailored both to the particular aircraft serial number range (ie to capture the AFM and loading manual limitations and requirements) and the particular aircraft's configuration ... you change the cabin a bit, etc., and the sheet is invalid.
Whatever you do .. please don't use something given to you by the friend of your cousin's wife, thrice removed .... a good way to get bitten badly.