Hi everyone, a new ..45 here

I am converting/rebuilding my ZAY7045 milling/drilling machine, and i'd like to change MT#4 spindle it has, to some 30 taper spindle.

I've found link to canadian "Machine tools warehouse" here, but it's been a month since and i assume, they not willing to sell me that iso30 spindle, for some reason
IHcnc.com wants $300 for their wersion of NT30, wich is too much in my opinion.

Can somebody tell me, if there is another source for 30 taper spindle for rf-45 clones?

Thanks!
wbr, Alexey
p.s. sorry for my english