Welcome to the board. I don't think you'll be able to find easy-out parking right near Wrigley for under $20. Some might charge as much as $30. Street parking might be an option if you're willing to look and not in a rush. Depending on where your hotel is, going north up to the Howard stop on the red line to park might work for you. If you park anywhere else, you'd have to transfer to the red line (not a big deal, of course). Gates open 2 hours before the game and you really shouldn't have to line up before that for a weekday April game. The Cubs BP session starts before gates open, so you'll only see about the last 20 minutes of it before the Reds hit.