Spent your daily budget on other things?! Try one of these cheap food options while in Amsterdam: 

Febo
Chain of fast food outlets that serves deep-fried snacks for about one Euro. You can retrieve your choice of snack, like croquettes, French fries or cheese soufflé from small vending machine style compartments. Get mayonnaise for the Dutch experience! Alternatively the city if full of snack bars that provide fast food at cheap prices.

Maoz Falafel
One of the cheapest meals in town serving falafels in warm pita bread at most of the hotspots in town. The upside is that you can fill up on as much salad and sauce as you want, for the same price.
Reguliersbreestraat 45, Muntplein 1

The Atrium
Self service student mensa with cafeteria food and cheap meals. Meals are served from 12noon-2pm and from 5pm- 730pm
Oudezijds Achterburgwal 237

Visit www.trippist.com for more local & budget info on Amsterdam.