Depends on what you consider cheap - there are fast food places everywhere along Harbor Blvd and Katella Ave which are the main streets near the convention center. I have a couple of restaurants about 2-3 miles away from the convention center that I love going to w/ prices no more than $15 (Thai food and Greek food). I'd avoid most of the Downtown Disney places as they can get pricy and will be super busy. The freeways are close by and there are a ton of different options if you want to get a few miles out.
There is the Anaheim Resort transit (as well as busses) running very frequently which drop you off in the middle of all of this at Disney and then it's a short walk over to the convention center. Depending on where you stay, you may be able to leave your car at your hotel and hop onto the public transportation. I live down the street (near Angel Stadium) so depending on what your plan is, I may be able to have you park here at the structure and provide you w/ a validated ticket to get out. There's a shuttle pick up and drop off next to my place. If I recall correctly, there aren't really any "cheap" parking structures in the area as the lots either belong to a hotel or a restaurant so the only public structure would be the Disney ones.
BTW, here is the link for public transportation:
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