What would be the alternative to spending the $200?
Spend nothing: Your game will not be released.
Spend 100$: Release the game without music?
Also, the $100 for iOS development is an annual fee. The $25 for android is a one off payment.
Before releasing though, make sure that your game is as polished and bug free as possible.
Also, if you want to make a profit and not just release it for fun you will have to make your game known. The chance of an app becoming successful without any advertising is virtually zero. Games like flappy bird are a very very rare exception.