There are no additional materials to buy with a dehydrator. Canning always requires new lids if you want to be certain of safety. And the bands often get bent or rust and need replaced as well. Sometimes your jars break and have to be replaced. The dehydrator runs on electricity of course, so there is that expense to consider. But, I have an electric range and canning requires me to boil GALLONS of water. So canning surely used more electricity.
Below is the garlic I peeled and dried in one day. I do have a garlic peeler. That is also something I avoided buying for a long time. But I had a chance to try one, and deicded it was well worth a few dollars.
The next picture is the sliced garlic cloves on the dehydrator before I closed it up and turned it on.