Okay, try this:
This is SEM's web site. http://www.sem.ws/
Click "Where to buy" on the left side, and then search for SUPPLIERS in New Jersey (where i think you are). Choose the store that is close to you.
To fix cracks: Try to remove as much of the old bondo/epoxy as you can and use one of SEMs plastics repair products. Look on the website (Catalog) for the product so you know what to ask for. I would try this http://www.sem.ws/product.php?product_id=198
I used to live in New Jersey, and there is a Sherwin-Williams store in Princeton on Harrison St. just north of Nassau St. that I used to buy from. They are helpful too.