Every Bitcoin transaction requires the sender to pay a small fee.
People often claim that with Bitcoin "you can send money between any two points on earth for free". While that is true in some cases, sometimes a transaction fee is required. The fee, when it is required, is usually worth a few dollars.
The fees go to the miners to incentivise them to keep mining, which in turn keeps the Bitcoin network secure.
At Seedsman, we look to offset this expenditure by offering discounts of up to 25% on orders paid with Bitcoin.