This is not as good as the EFM Havana deal, but that is due to the EFM Havana's higher overall price.
Still I think the Jam Audio Zero Chill is a good alternative to the popular UE Boom 3 which goes for around $100~$140. The Zero Chill and Boom 3 share a similar 2x 2 inch driver and 2x passive radiator design and are almost identical in size.
The Zero Chill is usually $89~$99 at other places, so this is around half price.
This deal is also free delivery for non Amazon Prime users since it is over the $39 spend.
Compared to the UE Boom 3. Zero Chill has "Up to" 22 hours battery life, compared to Up to 15 hours for UE Boom 3. Zero Chill has Aux-in, while Boom 3 doesn't. Boom 3 uses Bluetooth 4.1, UK website says Zero Chill uses BT4.2.
Both use Micro-USB for charging. Both are rated IP67 water-submersible.
Zero Chill's unique feature is it has an "integrated charging cable" so no need to worry about remembering to take a cable to charge.
Also one product worth considering for those willing to pay more than $100+ for a UE Boom 3.
Consider the Huawei & Devialet Sound Joy currently available for $141 shipped @ Amazon AU.
https://www.amazon.com.au/HUAWEI-Sound-Portable-Bluetooth-De…
It has a massive 8800mAh battery for Up to 26 hours playback and 30W total output power, 10w for separate tweeter and 20w for the woofer. It is also IP67 rated like the Boom 3 so I think the Huawei is better than the Boom 3 in every way for a similar price.
The separate tweeter and woofer makes the Huawei similar in design to the Sonos Roam which is $275.
With a freq response bottoming out at 170Hz, don't expect any thumping bass sections coming out of this