Costco has CyberPower 1400VA / 900Watts True Sine Wave Uninterruptible Power Supply (UPS) for $179.99-$30 = $149.99 with free S&H from 9/26/19 to 10/21/19.
IMO, this is a good price for a true sine wave UPS in the market at this moment.
https://www.costco.com/.product.1…ct
https://www.costco.com/.product.1…ct