You can get a refurbished S1500 (previous model) for about $300 which includes an Amazon 90-day guarantee:
https://www.amazon.com/Fujitsu-ScanSnap-Scanner-Certified-Refurbished/dp/B07HDJG9BG/
Also, Epson has the highly-rated WorkForce ES-400 for about $249 which is comparable to the Fujitsu scanner and even includes the valuable ultrasonic misfeed detection feature:
https://www.amazon.com/Epson-WorkForce-ES-400-Document-Scanner/dp/B01M4NANZ6/
If you're looking for something even faster, consider Fujitsu's excellent line of workgroup scanners (fi-5xxx / 6xxx / 7xxx series) which offer even greater speed and increased ADF capability (80 pages). These can be found refurbished starting at roughly the same price, but can get a bit more pricey as you go up in features. However, they are some of the best performing scanners on the market.