Take a look at your budget as well. Do you have a cell phone with a data plan? Going to a feature (dumb) phone will save you about $30 per month. Do you have cable TV with all the bells and whistles? Going to basic cable can save you some $$$ as well.
Please don’t get me wrong, I am not trying to preach. Just ask yourself a question with regards to your finances. What is more important to me?
If you choose to spend on item “A” rather than on preps, then item “A” is more important to you than survival.
As an aside, you can store quite a bit of your preps under your bed(s).
Under the bed, behind and under the couch and under the livingroom chair. Depending on your coffee table and end tables, there can be storage under and inside them. Think multi-purpose when you're in the market for furniture such as an interesting old trunk can be used as a coffee table and provide storage. If the door to the bedroom opens 90 degrees against a wall then there is room to put 6" shelves from floor to ceiling behind the door for smaller how-to books, canned goods, water, canisters, etc.
When on a budget, think second hand instead of buying new. Browse through thrift stores and yard sales. If a friend is throwing out something that you could use in prepping don't be hesitant to ask for it. Knowledge is power so as others have said, learn some new skills. Most knowledge and skills are free. If there's a free how-to at the hardware store then go. If the nursing home is having a quilting bee, take a plate of homemade cookies and sit in with them. Look up your county home extension office in the government pages of your phone book or online because they sometimes give free demonstrations for home canning, etc. and they'll have free info packets and are there to answer your questions. The library has meetings and lectures that are free to the public. Make the library and youtube your best friends for how-to books and videos. If your neighbor is doing a home repair, go over and ask to help so you will learn how to repair your own house.