[Update 2/28/15] I’ve been re-stacking the post order lately around whatever seems especially significant or interesting. This is the only device I’ve seen so far with dual electrode (sets of) capacity and I’m curious to hear if anyone has used the ApeX device.]

A device I’ve not seen previously. Looks to be simple to understand and well-crafted. Will have to wait for the Redditors to take it apart to know what’s inside. Looks like a one man operation, Claude Barreto. Reasonably priced as well. Interesting that you have to agree to the Terms and Conditions of Sale before you can get to the order form. I’m intrigued by the dual electrode option. That one could apply tDCS to two locations simultaneously is, I think, new for any of the DIY-level tDCS devices. [I am not affiliated with this or any other device mentioned on the site.]
Website: http://www.apexdevice.net/