You can buy Bonkers candy online directly from the manufacture. Candy stores that sell the candy may also sell them at their website. If you can not find this candy at these places it may be discontinued.
1 Additional Answer
Unfortunately there are no places that I can find that sell Bonkers Candy. It seems it has been discontinued and all the stores are out of stock. I hate when they discontinue something I really like. Even Ebay was out of Bonkers.