I'd second the mention of going back to eithe OD or Staples......you'd vastly overpay in a furniture store for an office/desk chair, and since office supply stores have office supplies and furniture, it'd be a natural for OD or Staples, the two with the largest selection of those type stores, to have something you'd want.
OD is having a huge markdown on their chairs right now.......and offering $25 off any chair over $99, in addition to any sales markdowns currently in place.
What I'd honestly recommend is NOT buying a chair from the 'net......never could understand how people buy a chair or speakers without ever sitting on it or listening to them. Every chair sits differently and every speaker has a different sound. Just because a chair is comfortable for someone else doesn't mean it'll fit you well, too. Same for speakers.....just because one person thinks they sound great doesn't mean your ears will appreciate them the same way.