Supports for determinate tomatoes in pots

I grow a few toms in pots on the patio usually small determinates. They always get straggly and droopy.  As  I'm fed up with twigs, sticks and string, I'm considering buying something st4onger that will poke into the pots to give a bit of support.  Along the same lines I don't grow bush toms in the ground outdoors because they droop and get manky. I might even consider a support or two for bigger varieties. 

Any advice on what and where to start looking?