Hi, is there anywhere on the net i can buy rubber stickers so i can stick them under my di boxes so they dont slide live?
Search rubber feet or rubber washers into google. You'll get a few options.
I just put together a pedalboard with a board covered in felt and velcro, which is also a good solution. Otherwise, rubber feet would be just fine.
Most of the gigs I work at (including bands such as Lamb of God, New Order, Slash, Mogwai, Flaming Lips) tend to use doubled over gaffa tape.
Any good hardware store (such as Home Depot) will have that stuff for sale. So will a lot of bathtub shops. It is cheap and a good idea.