Recommendations for outdoor storage shed

Shop Craig's List. We had a 6x8 metal shed that we had bought for $40 several years ago. Last year I gave it away on Craig's List. The guy and his wife lifted it onto my car trailer (I was recovering from surgery). I see sheds on Craig's List fairly often. Otherwise build something. I have my new garage, but still need more storage. I'm considering building a 10x12 on my new slab.