https://www.ebay.com/itm/126990715264?toolid=10001&customid=1e73ad8e434811f0ba1f9a396598699e0INT 4-Pack ECO-WORTHY 48V 100Ah LiFePO4 Batteries + 5KW 48V Solar Hybrid Inverter on sale for $4,199.99 - $1,000 with coupon code ECOWORTHYSUMMER at checkout = $3,199.99. Shipping is free.