A paper shredder is my new favorite tool.

It was time to harvest my worm castings, so I was slicing and cutting cardboard the other night. My 20 year old son was making suggestions to make it easier. I told him I was thinking about buying a shredder.  Long story short he found and fixed my parents old 8 sheet paper shredder.  My husband and son said it's a cheap quality and won't last. I could care less, it's free and cutting cardboard was actually fun instead of time consuming and painful for my hands.  I love it. Not only did it fill the worm bin,  now I can shred cardboard and paper as we get it. I will just put it in the compost. It helps me keep the house neater, will give me more compost, I can use it in the worm bin, shred documents with private information, and am using something most people would have sent to the dump.  If that's not a win I don't know what is.  As thrilled as I am with my shredder, I'm incredibly grateful to have a husband and son who can fix just about anything.  It never fails to amaze and impress me.  Yep the shredder is my new favorite garden tool.

Bravo, excellent recycle!

I may need to find a shredder myself. I have a slug problem this year...

Gardening enthusiasts can use cardboard shredder for composting or things like mushroom cultivation by simply moistening shredded cardboard and placing it with plants or worms. Shredded cardboard is a money-saving option for animal bedding for pets and even livestock animals. Use and re-use: You can use and re-use the cardboards which you have with you. If you have cardboard shredder machinery you will not have to order fresh cardboards every time during packaging or shipping. You will be able to re-use the cardboards that you have bought.

Jen, how is that 8-sheet shredder working for you now? Still holding up? I am thinking of buying a shredder to shred carboard for a worm bin and possibly chicken bedding too and am wondering how heavy-duty they have to be to hold up to carboard. I may just keep an eye out at thrift stores for now, seeing how pricey it is to buy one new.

I have a 12 sheet shredder and it doesn’t like cardboard. I put my cardboard in a big crate full of rainwater and leave it to soak and then rip it up into small chunks and add to my compost bin.

The shredder didn't last very long.  But to be fair my parents used it a long time, and my son said it wasn't a very good quality.
I bought a new shredder not long after this post. I bought a Bonsaii 15 sheet. I have been very happy with it, and it's still going strong.  
Basically I bought the shredder that would handle the most paper that I felt I could afford.  I think it was about 100.00.  I looked into actual cardboard shredder, but I could only find large industrial ones that were very expensive.  So my thinking was if it could handle plastic credit cards, and a large amounts of paper at once, then it should be able to handle cardboard.  
I love shopping at thrift stores, and like. I do have my doubts about finding a good shredder in one.  Seems like you wouldn't donate one that's working great.  You never know, I hope you find one, good luck.