E-Bay. Yes, pre recorded R2R tapes are hard to find, but e-bay has a vast selection. While most are 4 track, 3.75 speed, the treasurers are 2 track, 7.5 speed. A while back a Miles/Blue of the latter vintage went for almost $2K. Barcley Crooker tapes, perhaps the highest quality of pre recorded tapes also are sought out. Some of the latter go for $50 plus, however most are classical titles. Another area of pre recorded tapes are 'broadcast' masters. Most come on 10 inch reels, and are 2 track. The best of these are AFRTS tapes produced by the government for the military broadcast system. I have a few hundred of the latter and quality is very high, our government produced nothing but the very best, after all it was using taxpayer funds. I have about 6000 tapes in my collection and enjoy them everyday. I have about ten working tape machines.
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?