I tried two trees I found at the thrift store, but I think they are made of plastic and they didnt work. So I picked up the one's that she shows from Michael's. They were $14.99 here but on sale this week for $11 and some change. I also used the same color dye that she mentions. I got it in the laundry section at Walmart.
I think my favorites are the candy corn ones. My black and orange ones didn't come out too great, I guess I didnt let them dry enough. I wouldnt mind getting another batch and doing some more!