With the MK4 out now, you can find super cheap MK3S+'s on places like Facebook Marketplace and Craigslist (in the US). I have been seeing a ton of them listed locally lately. From what I have seen, you can pick one up for $400-$550 depending on whether prusa assembled it or it was a kit and what accessories it comes with.
I had an Ender 3 clone, and that is how I got into 3d printing. Would I buy one again, now that I have an Prusa MK3S+, no. Creality makes a good product for the cost, but it will cause you headaches and cost more in the long run. I probably spent $100 on parts my first year alone…more the following years. I have had my Prusa for 2 and haven’t spent a nickel on it and haven’t ever had to repair or adjust anything.
So take that for what it’s worth. From a SAFETY perspective, I trust the software and hardware on the Prusa over anything on the market. It has much more reliable failsafes and sensors looking for thermal issues. I never worry about my Prusa for safety. Just make sure you update it if they have any big firmware changes.