You can make additional payments on-line using either an ACH transaction from your bank (you need the bank routing number and your account number. Checking or Saving will both work). Or you can pay with a credit card. Ensure you make the initial 10% / 20% (180 day / 90 day layaway) down payment immediately to secure the inventory and the price. I'm sure you can probably mail in a payment or call to use credit card.

I just did this a couple times recently and I had to contact them via the Chat Now function and they are awesome! They fixed me up to do credit card payments in about 2 minutes total. I just gave them the order number and asked them to update my payments from checks.
After they do that, when you go to order history, you will see "Payments" and you can make your credit card payments there.

You can pay by check online by giving the routing and account #'s for layaway payments. This keeps the cash discount price! And yes you continue to make payments online by clicking on Order Status/Account on top of the homepage after logging in.

You can make the payments on-line or mail them to BudsGunShop.Com 1105 Industry Road Lexington, KY 40505, Remember when paying by check you get the cash discount