I have seen some on ebay before.
Doesn't mean a whole lot here. eBay products could be from anywhere, typically recasters. Here, you know the product is genuine and of a respectable quality. If you want to go with a crap product, sure, you can chance it with eBay. Personally, I'd rather pay the extra couple bucks and get something that's both original and well-made.
Rodimus, 3D printing sounds cheap when you look at it like "it's only 20 bucks a roll", but one, the filament I get is quality and actually around $35 per 3/4 kg, and two, you assume no wasted prints. Everyone who prints on these kind of "prosumer" printers will get bad prints here and there. It's just part of the process. With each failure comes lost time, something that cannot be made up no matter how you cut it.
As jackdoud pointed out, you're not just paying for the materials, either. You're paying for the time and skill that went into making the product. I recommend looking up the old "knowing where to put the x" story. Not sure if it actually happened or not, but there's enough truth in its concept to be perfectly relevant.
Don't quite understand Instagram yet, but...: thatnerdinatie
Founder (and so far sole member) of the Borderlands Ghostbusters