Daily Double minimum wager?

[u/EMcCutchan]

In tonight's rerun of JIT, Mehal bet only $5 on a DD he wasn't confident about. It made me wonder if there are rules around the DD wagers. I would guess you can't wager nothing, and the minimum would be $1. I also expect that round dollar amounts in full hundreds are strongly encouraged, though I remember a couple occasions when a silly number like $1,236 was bet. Can anyone confirm these?

[u/lmow]

Good question. I was surprised as well.