The new course will be an intermediate level course, not a replacement for B2B. You can do the current course without any regrets.
The list Josh put together before still works - all of those are fantastic basses. Yamaha has come out with a couple cheaper models in the TRBX line you chould check out, both of which got “best beginner bass” type accolades when they came out - but really in that price range there’s a whole lot of basses.
A lot depends on what styles you like as well. At the upper end of that range you can pick up excellent mid-level basses like the Ibanez SR500E, Yamaha BB434, Warwick Rockbasses, and Yamaha TRBX504, for example - which all have pretty different characteristics.
Really for an entry level bass in that range I would recommend something like the TRBX304 or Ibanez SR300, which would be closer to the lower end of that range but still be of outstanding quality. But those are very modern basses of a style I like; a lot depends on what styles you like.