Mr_GriefswaldYou're comparing refurbished to new, I just recently bought my D3400 last week from B&H. Needed something to use while I wait for A7RIII next year. IDK about buying used, if you're looking to shave some dollars then sure buy used. Only problem is that they only come with 90 Day warranty. The standard for new is 1 year if you really care about that. You don't really know why the camera is refurbished and taking a gamble regardless of how well it was inspected and an unknown shutter count. Not really a fan of refurbished because you get what you pay for. If it's for something that I don't care that much refurbished is not bad. The only thing I would consider buying used are lenses as some cost an arm and a leg.
This is not a bad deal if you're looking for a NEW D3300 but I went with the D3400 because it's slightly newer. Both models are recommended entry level DSLR's by Ken Rockwell.
This really isn't a good drop.
http://www.ebay.com/itm/Nikon-D3400-24-2MP-DSLR-Camera-18-55-VR-70-300m-Lenses-Bundle-Choose-Color/292031135490?ssPageName=STRK%3AMEBIDX%3AIT&var=591021964616&_trksid=p2060353.m1438.l2649