It really depends on the individual seller. Ebay, the company itself, has little influence, they just provide sellers and buyers with a platform.
Just be careful, make sure that the seller has good feedback. I've been shopping on ebay for over 6 years and I've only had good experiences so far.
At hip length, going for mid-thigh!
M MP HE HD (med text, med por, high elast, high dens)
Clarify: Nivea Intense Repair
Lo-poo: Nature's Gate CR
RO: TBS Rainforest Moisture, etc
LI: Elvive volume collagen, KCKT
Seal: Grapeseed oil
Gel: Kiss My Face
PT: EO Keratin co
Hair growth stim.: JBCO+EVCO
iherb.com 5-10$ discount code: VHT541 Many natural hair products!