Back in October, Australian anime publisher Siren Visual ran a month-long sale which according to them have prompted demands for “more, more more”. Therefore with Christmas around the corner, they are giving everyone the chance to score some of their discs at 30% off in the lead-up to Christmas via their official online store.
Add the items you want to your cart and then type in the promotional code DEC2013, which expires on the 15th December 2013.
My personal recommendation? If you are after something very niche yet very enjoyable, I recommend checking out Dennou Coil which as of last year is now available in a complete series collection.