If you are in the UK, I would check out https://www.nootropics.co.uk, they sell Bromantane here: https://www.nootropi...uct/bromantane/
It is not actually that common a Nootropic, so it can be a little harder to find, you are likely one of the early adopters of this compound.
The price is cheap and it is shipped from the UK, but most importantly it is the only place I could find with a COA, you can see it under the Analysis tab, but I have linked it directly here:
https://www.nootropi...te-745x1024.jpg
They also sell Phenibut, so it should be convenient for you if the stack works out.
Regarding the stack you are trying, as a general rule any stimulant combined with Phenibut will give you a good "working buzz", I have tried this with Phenibut and Adrafinil.
Please let me know how the stack goes!