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Where is the best place to shop 4 an EHD for Wii U?
Probably Amazon, a couple of good 1 TB drives (ie. WD's black My Passport or the Seagate expansion) are on sale. Those two in particular are actually newer versions of the drives endorsed by Nintendo in the first post.
Is an SD Card an option?
Only by using a SD -> USB adapter in a USB port. (I've been using a microSD card in this fashion with no issues.)
How much risk do I run of losing save data if I use an EHD without it's own power source?
You actually can use a Y-cable (about $10) and just use two Wii U USB ports for sufficient power. If you use a drive without a y-cable or other power source, I'd say 100%. I ran an app off of USB without a y-cable and it stopped running within 30 minutes.
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