My best friend's been ordering things lately from eBay (mainly for her Draco cosplay, so she's ordered a scarf/tie/wig and such, the scarf and tie from a well-known seller but her wig JUST got shipped out when she ordered it a good two weeks or so ago), but it just all depends on who you buy from, I guess. And the whole shipping process could take longer/shorter sometimes, too. Some sellers are more 'reliable' and 'well known' than others but watch out for those scammers, though~
(personally, eBay's all 'HUHWHAT' for me XD)