The default minimum order is for 10 seeds per species. When you click the 'Add to cart' button the system will put 10 seeds in your cart, and the price shown will be for 10 seeds.
However, you can increase quantities ordered, by entering how many seeds you want in the shopping cart display during checkout.
The website will give you prices and shipping costs - just enter the quantities into the shopping cart, and start the checkout process. Once the site knows where you live, and how many seeds you have ordered, it will show you the shipping cost. It will also apply any discounts or taxes that apply.
Before the order is finalized, you will be shown the total quantities and prices, and will have the option of cancelling.