My ISP is RCN Astound and I’m trying to “Bring my own” equipment. The system is working fine since I’m working 5-days from home and my wife works 3-days from home. Before I invest in my own equipment, one of my options is to replace my existing components. I have an Arris DG3450 and the router and extenders are Eero units. I’d like to purchase the same modem, DG3450 unit but can’t find it in Amazon nor in Best But. Anyone, even ARRIS, able to find a NEW Arris DG3450 for sale? If so, where and how much?