Great sounding speaker from Ultimate Ears - the Megablast. Comes with Alexa integrated if you're into that sort of thing.
Waterproof, dust proof with decent battery life, has reviewed well.
I'm not sure when the sale started but I think when I checked the price a couple of days ago it was at full retail of $379, so a very recent discount.
JB have 3 colours all on sale for $278 plus delivery ($101 off):