Yeah, I think buying the full bottles is likely your best bet. If you don't like them you wont have any trouble getting rid of them. The idea that nobody is trying to share any speaks volumes as well.
I have not tried the BF version, but when I asked about it over the winter, I had the pros from the UK tell me to get the Menzerna instead. They told me it was the perfect balance of lubes and powder. The added lubes will make not work as affective. I trust my sources 100% as they are the ones who turned me on to this polish back in the winter. Now the SIP madness begins.
I can't believe how cheap AG is. I wish they had it back in the end of the winter when I bought mine. I was just on their website and the 106 is on sale now too.