Where do you get your seeds?

[fintuckyfarms]

So I searched the threads and could not find any relating to where everybody gets their seeds from. Is it best to try local seeds or order on-line? The only real specific information I can find regarding hydroponics is with tomato plants where they suggested using bushing or patio varieties. So is there one best company? Is there really a huge difference in taste if I buy the heirloom varieties? I am looking to try out a large variety of plants from herbs, salad veggies and strawberries to eventually experimenting with root veggies.