Welcome to the forum.

It's nice to have you here and I'm glad you're doing research before you get your new turtle. My sincere advice to you is...
What ever you do, do NOT buy ANYTHING from [the online store that is sooo bad that it's very name is forbidden to even be mentioned here]. They regularly sell sick, dead or dying baby turtles and use very poor shipping practices. They are deliberately practicing animal cruelty at their facility as is evidenced by the condition of their animals (missing scutes, shell rot, fungus, respiratory illnesses, open sores/wounds, dehydration, you name it, they've done it). The
only reason they stay in business is because of their pretty website design and sweet sounding marketing ads as well as their very low prices. PETA is well aware of their operation and is currently working on tracking them down and nailing their a** to a wall. I sincerely hope they will shut down that torture pit and put those "people" behind bars where they belong.
If you want to read more about [that name that shall not be mentioned here] you can check out this very long thread about their sour dealings...
http://www.turtleforum.com/forum/upload/index.php?showtopic=63951