You mentioned cheap, so consider these fast food*/sit down type locations:
Porto's Bakery & Cafe
portosbakery.com
(818) 846-9100 - 3614 W Magnolia Blvd, Burbank, CA
They have 2 locations (1 in Glendale & 1 in Burbank)
Excellent cuban sandwiches; coffees, baked goods & pasteries (Try the potato balls & croquettes)
KOO KOO ROO* is good too (like the other answerer mentioned)
IN N OUT BURGERS*.....of course!
This is on the edge of Burbank & North Hollywood:
LA MARIA RESTAURANT
(great authentic Columbian food, inexpensive little local restaurant)
(818) 755-8811
10516 Victory Blvd, North Hollywood, CA
This is nearby Burbank in EAGLE ROCK if you like pizza (this is a cash only location):
CASA BIANCA on Colorado in Eagle Rock
Excellent thin crust pizzas & pastas (An "institution" for the area)
(Go early to avoid loooonnng waits)
Hopes these help you out!