Needlesports do some BD spares or the UK distributor First Ascent may be able to help, they were excellent for me.
My Z pole tips remove using a pair of self grips, dont know about flick locks though.
Yes, just order them on the t'internet, e.g here
I hate to admit to being so girly but I asked a male friend with lots of workbench and blowtorch and pliers and hot glue gun type stuff to do them for me. If you get the tips I could ask him...
LEKI are pole specialists - making poles is what they do
No matter your idea of fun, the new CNX footwear range is made for play