I noticed that in their ebay feedback they have quite a few comments about super slow shipping for items that they already have in stock and lack of communication. Many of those still give positive feedback though because of the quality of the items is good.

Even assuming they go once a week to the post office to send orders then another 7 to 10 days for the post office to deliver, an ebay item from an experienced seller shouldn't take more than 3 weeks in my opinion.