My parents just recently moved out of their home, and because they are getting older, I had to go back home and help them. The boxes they were using to pack where the boxes we used when we were moving into the house 20 years ago. My wife and I just moved into our own home, and one of my college professors told me about Smooth Move Supplies.
I know this sounds dumb, but these boxes were awesome. They had built in handles, they didn't need any tape, and they were very sturdy. On top of it all, we got free shipping. Anyway, it helped us out a lot, and it helped my parents as well.