Like everybody else i purchase most things online, specially since in Spain you can't find R1 DVDs in many sites, and the sitres that carry them don't have them on display and have heavy import taxes.
The last DVD i purchased offline was an R2 (European) of the studio ghibli movie "The Moving Castle". Since studio ghibli movies carry many audio and subtitle tracks there was no problem. So now, when was that? don't remember, when was it released? I didn't get it that soon probably several months after the release.
I rarely buy single DVDs, and I rarely buy offline. The last one I bought was Saiyuki Reload Gunlock vol. 5 at Suncoast. They were having a half price Geneon sale.