A lot of Minecraft stuff can be found at Jinx.com. You can find some of Jinx's stuff at Target though, and sometimes its cheaper than actually buying from Jinx. At least when it comes to the shirts- toys are the same price (unless Target is having a sale or has a Cartwheel for them). Etsy is also very good if you're looking for something with a homemade touch. Think Geek and Barnes and Noble are very good places to find Minecraft items that may be sold out on other sites. Today's gift guides are kind of a mishmash for any age/any gender that likes to play the game.
Chest Wallet / Creeper necklace / LEGO Minecraft / J!NX : Minecraft Line Time Premium Tee / Minecraft: The Complete Handbook Collection / Minecraft: The Unlikely Tale of Markus "Notch" Persson / Minecraft Core Survival Pack : Target / J!NX Minecraft Diamond Wrapping Paper / J!NX : Minecraft Steve Pets Sticker Pack / Minecraft Boys' Graphic Tee - Blue : Target