Pre-recorded Reel-to Reel tapes

About 30 years ago, I had a nice 4 channel Reel-to Reel tape machine. I think that was the best fidelity I've ever heard. I have researched a little, but haven't found many pre-recorded tapes available. I guess it's almost like searching for 78 records. I'm loving my vinyl, but wish I could find a place that offered many titles of tapes. Is there such a place?