The falling price of SSDs is really hitting a new low point. A decent 480GB SSD is now under $100. When I first upgraded my MacBook Pro's internal factory-installed hard drive to a SSD a few years back, a 480GB SSD cost me somewhere in the proximity of $500.
And while yes, there are very different types of SSDs to choose from with a variety of different operating speeds, the fact that a decent one like this SanDisk 480GB SSD Plus costs just $99 is pretty amazing. Get one.