“Cheap Eats” or “reasonable cost” places to eat are a topics that come up a lot. There are the links in the Top Questions About Oahu section that pull up a series of links to articles and TripAdvisor topics. Here are some of those links and topics.

http://www.latimes.com/travel/la-trw-...

http://www.k5thehometeam.com/global/C...

Waikiki Cheap Eats

Good and Cheap Eats on Oahu

Mitsu-Ken on North King Street  in Kalihi District of Honolulu  sells the  most  ONOLICIOUS (Very Tasty) Garlic chicken.  Operation is out of small house locale, but with the car windows down you all can probably smell its aroma to the correct address.  

Kalihi  Distict  also has many other Cheap Eats Spots to eat at.  One even has Spot in its name on Dillingham Blvd right side headed Diamondhead (east). Kalihi District  is poetically an old neighbor area. 3 major thoroughfares traverse it.   

A really good website to get  video walk through of many Cheap Eats places on Oahu and even periodically at neighbor islands  is on khnl.com  (NBC)  link to CHEAPS EATS.

Other favorite "cheap eats" spots to look at are Nico's Pier 38 and Uncle's Fish Market & Grill in the harbor area;  Mei Sum Dim Sum and Little Village in Chinatown; Vino, Seoul Garden Yakiniku and Shirokiya Food Hall near Ala Moana Mall; Me BBQ (Korean BBQ), Duke's Barefoot Bar, Huka Grill Plantation Bar, Fatty's Chinese Kitchen, MAC 24-7, Lulu's and Wailana Coffee House, Eggs 'n Things in Waikiki; and the Diamond Head Market and Grill the Farmers Open Market (KCC on Saturday's) near Diamond Head.

Waikiki an Honolulu also have a lot of very good, inexpensive ramen houses; Goma Ichi Ramen, Goma Tei Ramen, Ezogiku, Yotteko-ya Kyoto Ramen, Ramen Nakamura, Tenkaippin Ramen, Matsugen, Taishoken, Kiwami Ramen and Marukame Udon,

For good, inexpensive Vietnamese; Pho To-Chau Vietnamese, Pho 97, Bac Nam, 99 Coffee Shop and Huong Lan.

The McCully Shopping Center, just outside Waikiki has a lot of great places that are reasonable; Bistro A Un, a Japanese izakaya, Fook Yuen Chinese Seafood, Hot Pot Heaven, Regal Diner for Hawaiian plate lunch, Pho777 Vietnamese, Phuket Thai, Yotteko-ya Kyoto Ramen and Curry House Coco Ichibanya.

Just off Kapahulu, near Waikiki are the Rainbow Drive-in, the Side Street Inn, Ono Hawaiian Food and a Zippy's.

The food courts at Ala Moana Mall, the Royal Hawaiian Center, Windward Mall, Kahala Mall, Pearlridge Mall and Waikiki Shopping Plaza.

Kaimuki has several good inexpensive spots like Storto's Deli & Sandwich Shoppe, St Louis Drive-in,  W & M Bar-B-Q Burgers and The Fat Greek.

For local food (Hawaiian) check out Helena's Hawaiian Food, Ono Hawaiian Food, Palace Saimin and Libby Manapua Shop.

For dim sum look at Char Hung Sut, Fook Lam, Royal Kitchen and Royal Garden.

You can also "eat cheap" at some of Honolulu's better restaurants at Happy Hour, or Aloha Hour as many Hawaiian restaurants call it. Roy's, Morton's Steakhouse, Hula Grill and others. Do searches for Pau Hana (end of day specials) too.

The TGIF supplement to the Star Advertiser, Pulse, has good ideas and specials every week.