Well for those folks that are not audiophiles, if you want a unit to digitize your collection of LPs and cassettes, I found a 4 in 1 unit called a TEAC R550 USB that I've been using converting my audio collection to CDs and MP3s. Simple to use and gives pretty good quality when transferring. Price is right and certainly beats all the old equipment that I was using just to get music to a computer.
I do buy a lot of cassettes these days when I can find them. New LPs are way overpriced IMO, and the used version are certainly beat up after being in circulation for so many years. Cassettes tend to hold together better and as Joe said you can usually get them cheaper than a used LP or CD.