Do you do a ton of shopping but don't always keep track of prices after the fact? Did you know that prices online change all the time, and most merchants have a price guarantee program? Paribus is a service that lets you find out if stores you’ve shopped at online owe you a refund.  It’s free to sign up. Paribus connects to your email account and checks your receipts.  If they find out a retailer has dropped their price they file a price adjustment claim for you.
I think what you’re asking is how you can make extra money to pay your real estate taxes. If that’s the case, it depends on your current financial situation, the amount of your estate taxes, your skills, and more. If you visit the “Make Money” section of our website, we have a few articles with different ideas that may be helpful for your situation:

Have qualifications to show. You might show your degree, high grade average in a course or other proof that you’re qualified to tutor that topic. If you have a teaching degree, you may be more likely to land a tutoring position. If you’ve spoken at a conference or event about the topic, you might also be considered for an online tutoring, teaching or mentoring position. Focus on tutoring in your field of expertise. If you’re not the best, you probably shouldn’t be tutoring in that specific topic.
 If you’ve got some free time and don’t live in the middle of nowhere, becoming a Lyft driver can be a very lucrative side hustle that allows you make money fast. And right now, they’ve got a promotion going on where any new driver will instantly get a $300 bonus after completing their 100th ride. If you start now and hustle hard on the weekends, you can probably unlock that bonus within a few weeks of driving (and that’s in addition to your normal earnings).