Which USB podcast microphone for under 150 euros?

Check out the Audio-Technica AT2020USB+ - it's within budget, has solid build quality, and gets recommended by podcasters all the time. Alternatively, the Rode NT1 Signature Series or the Samson Q2U are solid options if you want something more flexible with an XLR connection. The important thing is to get a sturdy stand or boom arm to go with it, otherwise even the best mic won't do you any good - they usually only come with a cheap plastic stand.

I grabbed the Blue Yeti USB a while back because I wanted to record a few podcast episodes with it - it's well under 150 euros and the audio quality is really solid for the price. Sure, the thing is kind of bulky and takes up space on your desk, but the clarity is good enough that you don't have to mess around much in post-production. If you want something more compact, I'd also check out the Fifine K669B - it's even cheaper and sounds surprisingly clean. Especially if you want to do streams on the side too, it's flexible enough for that.