This will explain what the ECH/ACH payment is about.
budsgunshop.com/payment.php

e Check price is the price with the 3% cash discount

Good evening to you!! Here's what Bud's says about e checks
budsgunshop.com/payment.php

Hi Dirk, e-check price is a 3% discount rather than paying by credit card. It should be available on all new firearms. E-check is electronic payment transferred from your bank account. It is just like paying by personal check or money order, which you can also do. You can choose that option at the payment page during checkout.
Otherwise, you pay 3% more by using a credit card.
budsgunshop.com/payment.php />budsgunshop.com/payment.php

Hi Dirk and welcome. An eCheck (electronic check) is a digital alternative to a physical check, processed through the Automated Clearing House (ACH) network. The ACH network is the infrastructure that allows banks to electronically transfer funds between each other. In essence, an eCheck is a type of ACH payment, but the term "eCheck" specifically refers to digital checks. Buds payment options listed here: budsgunshop.com/payment.php