Is this Ebay listing for a Leica 360° mini prism legit?

I found something I'm interested in having the company purchase on eBay. Just over $100 with (free?) shipping from China. First link: http://www.ebay.ca/itm/New-Mini-360-Degree-Prism-for-Leica-ATR-Total-station-Replacement-of-GRZ101S-/292174266533?hash=item4406f180a5:g:g1gAAOSwjk9ZXhHl&autorefresh=true

I've seen these prism and rod sets listed on other websites for $500+

Does anyone know if a) it's scam b) it's a knock-off or c) I just don't have any sense of how much cheaper surveying supplies are on the interwebs vs the local shop

I also found this listing as well: http://www.ebay.ca/itm/NEW-360-degree-Mini-Prism-for-LEICA-TOPCON-SOKKIA-NIKON-Total-Stations/281794407245?_trkparms=aid%3D777003%26algo%3DDISCL.MBE%26ao%3D1%26asc%3D20140620091411%26meid%3D1589f6b7040e4db8a0cfa6d422bbbc5a%26pid%3D100009%26rk%3D3%26rkt%3D10%26sd%3D292174266533&_trksid=p2047675.c100009.m1982