1. Speck Hard Shell Case for MacBook Air
Available in clear and quite a few vivid colors.It keeps your Macbook from scratches and surface damage without adding weight to it.
2. Seagate Portable External Hard Drive for Mac
Really light and tiny harddrive that works perfectly with time machine to back up your mac. For a $69 it adds 1TB of storage space to your computer when you plug it in with a USB drive.(If 1 TB doesn't mean anything to you, imagine the storage of 64 basic iphones)
It is the size of a phone and is very sturdy and portable.
3. Apple "Magic" Mouse
The Apple Magic Mouse is the standard accessory for any mac (that you have to pay out of your own pocket). However pretty much any USB Mouse works. You can find an infinite amount of choices on Amazon (yes no one beat their price) including many Apple knock-offs. 
