I'm fairly new to the game and even newer to online trading, but I've been buying and selling things online for as long as I remember. Check my eBay feedback if you're curious (username jonrigatti).

Cards will be shipped USPS with in rigid toploaders, or at least in a sleeve with a toploader as a backing. Unfortunately for my bank account, I've bought enough cards online at this point to know how to safely ship them.

Happy trading!