Well no new Echos with the puck design, but if you still want a gen 3 Dot, Amazon has them on sale right now for $14.99, which is the lowest price ever.

https://www.amazon.com/Echo-Dot/dp/B07FZ8S74R

EDIT: Or for $2.98 extra get the Philips Hue white bulb included.

https://www.amazon.com/Echo-Dot/dp/B0BGZ6QYKP

Not bad for a regular $25 bulb