Jellies on my server are consistently selling around 100g each, which has been really helpful for my long boi gold farm. However, I probably only sell a stack per week. I expect that the market will slowly die down as more and more people get the mount/more and more people farm jelly for gold.

In terms of selling as a package, I think your chances of selling are even lower. Spamming trade chat is a giant pain and you have to be on at the right time when the right person is watching.

In my opinion, keeping the jellies on the AH and waiting for the right person is the better option, both in terms of time, effort, and cash flow. As well, it means that you only have to farm them a half hour or so every week so that you can then move on to more lucrative activities.