Part of the "Deal of the Day", Amazon has the 2.6W solar panels on sale for $37.49 today.
According to CamelCamelCamel, this is the lowest price by $1.50, so it seems like a good deal!
Edit: Also on sale is the Eufy SoloCam E40 at $99.99, and the eufyCam 2 Pro four-cam kit for $405.99, which is tied for historic low price, according to CamelCamelCamel.
The E40 is also on sale for the pre-order price ($99)! With Amazon's much-faster shipping and easier return policy, regretting placing my order directly with Eufy last night lol. 🤦♂️