I use a human baby scale. Shows pounds and ounces. Used to be that everyone who ever had a kid owned one. I remember my mom using hers years after my younger siblings were too big for it to weigh various vegetables when the amounts were given in pounds for canning. Mine has definitely seen better days and I'm holding on to it hoping it lasts for many more years because I haven't seen one newer.
If they don't have any in the stores, try flea markets, yard sales, even ebay.