Where I work they are selling all their books on tape for $2 plus I get a (decent) discount.  I started to write down the names and titles (some are newer like a few David baldacci, Janet Evonivitch etc) to check out on here but then I realized they are ALL tape.  Would it be worth it to buy any to post?  It's not necessarily the credits I am after but wondering if books on TAPE are at all in demand...

I wouldn't. CDS yes but even those are becoming more common.  When I joined 3yrs ago, there were very few Audio CDs available in the system and now there's lots of them.

Also I frequently see people in the book bazaar offering audio cassettes 2 for 1. 

If you can, write down the ISBN #'s of some and see if they are WL. Some of the older audios that haven't been released on CD are sometimes WL.  The cassettes are also more expensive to mail than CDs-they're heavier and usually require a box which adds to the weight for postage. If you are going to listen to them first then it might be worth it-but probably not just to post for credits.

I ended up donating a bunch of my cassette books because they weren't moving. But I had to move and didn't want to move them.  The only ones that I had that went quickly were my Stephanie Plums and my Harry Potters. I don't think  the Plum cassettes are WL anymore but some might.

I would see which are WL.  I have gotten rid of 3 audio cassettes, but 2 sat for sometime and I still have one that has been there forever. 

If they aren't new, then I would worry the condition.  If they skip or damaged then you could be losing credits/postage in the end.   At least with CDs you can tell if they are scratched.

I wouldn't bother for the reasons already listed, unless they are books you really like.  I was able to get rid of a few audio cassette books, but the last two on my shelf have been there forever.  I've been offering to send both of them for 1 credit, and still no one wants them. Many people do not own cassette players any more. 

Check here and see if there are any copies available, and if there are no copies available then you may be more likely to get rid of them.  If people are on the wishlist of an audio CD book, they may order the cassette version just to get the book more quickly. 

When I joined I guess about 3 years ago, I had a bunch and they were quickly ordered.  Now I have had 1 request in the last year for a book on TAPE I think, but CD's go fast.    I wouldn't get them if I were you, unless they were books you wanted to hear.

As others have said, check to see if the ISBNs of those available might be wishlisted. I personally don't even own a cassette deck or player anymore and I don't know many people who do!

Cheryl