Cheapest places to eat in Olu (if they are still there) are Kumsal Pide which is at the opposite end of the beach to the lagoon and down the main street there was a small rooftop pide place which was fab I think it was near the Asena

For a cheaper B&B hotel, see if you can get into the Morina - its one of the ones right at the back of the resort, quiet, clean and friendly

Just had a look at the Morina on Jewel in the Crown - bed and breakfast £84 each