Herballife on ebay?

Hey guys,
I found you could buy shapeworks products on ebay for really cheap compared with the retail price.
Is it worth it to get it from ebay? the only reason i'm worried is because i dont know if the seller might have mixed something in it..or something and than put the seal back on.;
is it safe to get the herbal products from ebay or could someone tell me a good and reliable site to get these products for cheap?
thanks
Be careful with those herbal remedies. They can have serious side effects, and may not mix well with common medicines. And buying stuff on ebay increases the risk.