There are a few places where you can find heavy duty metal legs for your farm table. The first place to check is your local hardware store. They should have a selection of metal legs that you can choose from. Another place to look is online. There are many websites that sell furniture legs, and some of them specialize in metal legs. Finally, you can also check with a custom furniture maker. They may be able to create metal legs for your table that are not available anywhere else.