It recently changed. I have discount of 25%, probably it is permanent, just had to rest password on the new shop as I ordered more than 3 times. Anyway, their current prices are somehow off, it is cheaper to buy 2x 500g than 1kg pack. Will see for next time and if they will reply to my email. When it comes to quality, I saw no difference in quality among vendors, it is all the same. Only KB I get wobbles very easy which isn't great.