When I use TodayTix Lotteries and have won, the price for the ticket has always been what they post, $20 or $25, etc.
I assume Dear Evan Hansen and Comet are the same, although I haven't won those.
Oslo and Groundhog Day are different. You can enter for several days in that week. I won Groundhog Day today for tomorrow. Ticket price is listed as $39.50. However after I got to check out, $5.00 "fee" was added to that for a total of $44.50. Now I know that's still cheap, but I was surprised by the extra fee not stated in the initial drawing page. I have thought that these Lotteries have been going up in price lately and this confirmed it. I assume Oslo has the same price added. What the "fee" is, I don't know and they don't tell you.
Just a head's up.