Amazon with Aaoyun Direct has the Aaoyun 300W / 296Wh Portable Power Station with 100W USB-C In/Output on sale for $130 - 27% off coupon (click checkbox) - $39 off with coupon code WQTL7GYM at checkout = $56 with free shipping. Around 19 cents per Wh, but not a LiFePO4 battery. Ports include:

• 1 300W AC outlet, 1 100W USB-C PD port (in/output), 3 QC 3.0 USB-A ports (22.5W each), 1 car port, and 1 DC port