The listed prices are per 100 grams for amounts up to 2 kg. There is a price drop at 2 kg, and again at 10 kg. The software will automatically adjust the price. Crushing is an extra 30 cents per kg. The minimum buy amount per variety is 500 grams.
If you need a variety of malts for a single grain bill or recipe then go to Grain bills & recipes. Enter the amount of grain in total you want and specify the amounts for each malt in the instructions at the checkout. The grain is sold at a flat rate per kg.