That could be about right including tax. Of course if you have an AP, FL resident, or a regular park ticket for that day, discounts (big discounts) are available.
If you are buying an event only ticket, HHN costs as much as a one-day ticket. However, if you have a one-day, multiday, or AP, you can get a HHN ticket for about $25.
Yes Becca, it does. I posted awhile back that I upgraded our 4 park flex to include HHN, and now I can't remember the price for sure, but seems like it was $20-25. You might check page 3 or so as there was more info on it.
I looked back. It was on page 3. The price was $19.95 with the flex. I already had my flex so they are just charging my AMEX and sending the tickets. They give you a confirmation number.
The price will be a little higher if you have an Adventurer Pass (typically around $24.95).
The $19.95 + tax price is for guests who already have been to Universal Studios Florida during the day. Since an Adventurer Pass is only good for IOA, the price will be $24.95 (price for guests who already have been to Islands of Adventure that day).