If you want to buy Scrivener or Scapple, the powerful writing and outlining/brainstorming apps from www.literatureandlatte.com, the following deals might interest you:
wccftech.com is selling a Scrivener license for $20, basically a steal. Also gizmodo Australia is offering it for $30 AUD (around $22,5 USD).
Gizmodo Australia is selling it for $12 AUD (which is $8,99 USD according to their websites.
See the sources here (including links to buy):