It looks like its available on Amazon Prime. Season 1 is on DVD, not sure about the others. here's a link

https://www.amazon.com/R-L-Stines-Haunting-Hour-Vol-1/dp/B0089BSODC/ref=sr\_1\_12?dchild=1&keywords=the+haunting+hour&qid=1622778896&sr=8-12