OP- HoJo's currently has lots of dates avail at the ET/Retro Rate of $59/night for Jan & Feb
http://www.boards.hojoanaheim.com/viewtopic.php?f=13&t=14. When planning on a budget, I always start here! You just CAN'T beat $59/night for a clean, comfy hotel within walking distance!

Call in house res asap so that you can get this rate- they sell out quick!
Are you driving or flying? Jet Blue currently has flights for $89/one way flying into Long Beach. Well...coming from my area anyways.

If driving, take advantage of being able to pack your own meals and depending on how long of a drive, try to drive straight through- thus saving you hotel costs.
When we drive, I always make & freeze some meals ahead of time. Think homemade mac & cheese or chili- both reheat in the micro very easy and are filling crowd pleasers! I also bake some muffins (Costco sized!) and freeze those for breakfasts in the park.
Try getting the "gas buddy" app for your phone, so that way you can always find the cheapest gas while on the road.
You can sign up for restaurant coupons before you go- I recommend 2 weeks prior as most coupons will expire within 2 weeks of signing up. I know that MiMi's which is right next door to the HoJo's has coupons for FREE entrees all the time. Just go to their website and sign up!
Getawaytoday also offers coupons for the Anaheim area and you can always try the SoCal state tourist websites for additional coupons.
And if you're visiting any other theme parks or doing anything else while in SoCal, try buying tickets ahead of time to save money. For example we are going to a few museums in San Diego. By simply buying them online prior to our trip, I can save $5-10. It's not much, but every little bit helps!
My budget is $2500 for 2 adults/1child for 10-14 days. This includes ALL meals, hotels, gas, activites/tix, souveniers, etc. And most times I am able to stay within my budget.

I would LOVE to be able to double that and spend $5K but if we want to go every year or so....this is just the way we have to do it. And personally, I would much rather go yearly and do it on a budget then have to wait every few years!
Good luck! You can do it!!