How charge custom Li-ion pack 36v 10s6p
I am guessing that you mean a 10s6p, not 10X?  The lithium ion BMS board that you linked to is for a 10s battery. 

Are you building your battery or have you bought it?  If you are building it, then you need to add a balance cable with a JST-XH female connector. 

With this, you should be able to charge your battery with its BMS using a number of chargers. One example that comes to mind is the imax 1010B+ charger. You can go to the Imax web site and look at their chargers. They are not cheap, but certainly less than the $300 you quoted above for a power supply. With the imax charger you will get a proper balance charge of your battery using the proper CCCV charge algorithm which you won't get with a straight power supply.