Hello.
Regarding the VSF and TD models: Lately, there have been episodes where some dealers have sold some models that they were able to get at one time or another, and I believe that sometimes the desire for a particular model may coincide with the situation when the TD received her in a specific period of time, but apparently, it is difficult.
There is no free access to VSF models as before, and it is not a fact that there will be.
There are no direct alternatives for VSF, and even approximate ones. For PAM438 - for sure.
The HWF factory only makes models for 6497, such as PAM000 / 005/111/773/777/916/1084/1085 and some others. By itself, their quality is satisfactory, but no more, for most models, relative to what happened before from other manufacturers.
There are also smaller factories like the King or the XC and these are very modest attempts, however this is probably the only way to get a new automatic PAM.
In conclusion, answering the question: Where can I get it? My answer is:
At this point, formally VSF is completely OOS, and all the options are clear: Accidentally find some model that has been lying around for some reason, which remained in the dealer's hands, wait for the situation to change, choose a model of another factory that you like, and the most reasonable, contact m2m where you do it the fastest.
Anyway, good luck!