The whole point of this practice is to keep expanding my mind and my experiences and remind myself that music is vast and that there is infinitely more that I do not know than what I do know.
I'm lucky. I get most of my CDs for free because of my CD reviewing jobs, so I almost never actually buy one. One of the benefits of my work for the American Record Guide is that I get to pick "extra" recording (ones I don't have to review) from a list or mystery recordings of varying quality a few times a year.
I guess that If I weren't in this position I would go to the library and take out CDs or LPs. That's what libraries are there for. The under-use of the music section of our university library always amazes me.
One of my violin students, a college student who has been playing for a year and a half, showed me a method book (in facsimile) with a series of violin etudes by Geminiani that he was very excited about finding in the local university library. I told him that I took it out of the library some years ago and worked through it. The last check-out date was 1991. Yup, that was me. I was shocked that in the 15 or 16 years between 1991 and now nobody checked out this extremely valuable treatise.