There's no need for apologies, eastPride!
Even if only one person (me) benefits from your post, your effort is appreciated!
Even in Jude's review of the Beyerdynamic DT 1350, he mentions that they never seem to be discounted. They're not typically sold through consumer channels. Amazon has never sold them - only some of their Marketplace Sellers offer them through Amazon.
I don't want to belabor this excessively, but this is a truly great headphone that's available at a price not seen before.
I've had my eye on the DT 1350 for a long time and I am thrilled to get them for $254.15 with free shipping. That's lower than camelcamelcamel has seen (and lower than I've ever seen) - thanks to the 15% discount you found.
Quoting Tyll Hertsens of Innerfidelity.com, at 4 mins and 45 seconds into his video review of the DT 1350:
Here is his written review: http://www.innerfidelity.com/content/awesome-beyerdynamic-dt-1350