Here are a few Kindle eBooks that are free at time of post. Keep in mind that prices flip fast on Amazon so be sure to check the current price before purchasing.
Feed the Pig: Tons of Tips to Pinch, Stretch, and Save Your Money – This one is free again. I’ve been reading this one on my phone while waiting for the kids to get out of school.
Remember, you don’t need a Kindle to read these as you can download an App for cell phones, PCs, Macs, etc.