I spent a few years laser focused on web property arbitrage in my spare time.
This is my general advice:
* The deals at the lower end (a budget of $2500 is in that segment) are often trash. You'll need to spend an insane amount of time vetting those deals. And most will be niche products with either no route to profit or a severe decline.
* The best deals are the really poorly built PHP SAAS applications run by an old tech-oriented person that has zero marketing experience (one of my best flips was an awful codeigniter tool related to pets.. I literally only added Adsense, cleaned up the copy, and slightly improved the loadspeed, then sold it for a 2x profit).
* If it's a prior flip (e.g the current owner is not the original creator), turn around and find something else. Sometimes they are fantastic, but it's usually a terrible idea.
* Flippa is the Amazon <2015 of web property purchases (in terms of product quality). The best deals are usually in forums, Reddit, or even locally if you know a lot of devs.