Prophillo 

Prices for pyros have gone crazy up lately, as a-PiHP got banned in netherlands (And as we all know how much RCs are sent from netherlands to rest of EU), and i doubt they'll go back down soon. Yeah, maybe for next few months from on there will still be some pyros like MDPiHP shipped from NL but  on July 1st all cathinones (all derivatives of 2-phenethylamine in general) are banned under new blanket ban anyways.
I don't know honestly where to look for a-PiHP/PHP now, but you can check out this shop - https://dopal.org/showthread.php?tid=3822
they got 2-me-PiHP and MDPiHP. They send parcels both from China and from EU countries, depends what you're ordering and how much, etc. Last time i placed an order here was like 6 months ago, but it seems the shop is still working normally.

As for your second question, here is a section dedicated to various stimulants in general, not from any specific store in particular. Just find a thread dedicated to the substance you want to describe your experience with
https://dopal.org/forumdisplay.php?fid=27