Hideaway does have great discount rates...and really good homecooking.
The only draw back is....it's a little bit out of town. If you don't mind walking a lot it's great.
I'm assuming if your trying to save money, you'd rather not rent a golf cart or pay a bundle in Taxi's.
I wouldn't say it's a short walk to Amigos Del Mar.....a good 30 minutes at a reasonable pace. Not bad if it's a leisure walk.....but if your in a rush to get to a dive....it could work up a good sweat. Remember, it's hot here....LOL
You could also dive with Bottom Time Dive Shop.....a little closer to the Hideaway....and very good. Ask for divemaster Rudy...and tell him Tammy sent you. He's great...my first divemaster in Belize....and a good friend now.
Some budget places in town you can look at are:
Ruby's, Coral Beach, Spindrift, Lily's and Conch Shell.
Look under the lodging section of this website. There is a link at the top of the page.
If you want to save money and are not picky about having the absolute best in accomodations....I would look at the budget places in town so you can save on transportation and be close to everything.
Save your money for your diving!
Have a great trip!