Harman Audio currently has the latest Onyx Studio Bluetooth speaker, the Onyx Studio 4, on sale for just $199. That is a massive price decrease from its original price of $449. And for $199, you're getting a lot of speaker and a lot of sound.
The Harman Kardon Onyx Studio 4 is a wireless speaker, and can be "portable", with its 8 hours of battery life. But it is a fairly large speaker, so you'll likely keep it in one place. It does put out a ton of sound, thanks to two 75mm woofers, and two 20mm tweeters inside. The Onyx Studio 4 is able to get plenty loud without distorting the audio coming out of the speaker. It works with the HK Connect+ app, which is going to allow you to connect it to other HK Connect+ enabled speakers (there are over 100 of them available right now). And it can also be connected to two different smart devices at the same time and play music from both. It doesn't have Alexa, but it does have Siri and Google Assistant through your smartphone. So if you connect an Android smartphone to the Onyx Studio 4, you'll get Google Assistant over Bluetooth.
Harman Audio is the official store for all of Harman's products, and it does offer up free shipping. In fact, you'll get free 2nd day air shipping on all speakers and headphones that are over $19, which this is definitely over that price. There are some taxes collected here, which will depend on your State.