Thought your name looked a little familiar... you were in the custom Mando at Armageddon in Wellington right?
I've been getting my fiberglass and resin from
NZ Fiberglass, they're up in Auckland but they ship nationwide.
The stuff I've been using is the "Orthophthalic Polyester Laminating Resin" 4kg Resin Kit for $70.00, as far as I can tell it's the same stuff that you'd get from somewhere like Supercheap but for a whole lot less... I think I probably would have paid about $80 for two of the Supercheap kits which couldn't have been more than 250ml resin each and a tiny about of mat
I don't know if there's one brand in particular that's best but the Ados/CRC epoxy resin is good an reasonably priced as well.
If you do find any suppliers local to you drop a post in
this thread and I'll add it to the list, in case there are others nearby looking
As far as tape goes, I haven't had experience with tape and polyester resin, only epoxy resin which doesn't do anything to it. I think the polyester might react badly with the adhesive but you'd probably be best to test it on a small piece first (unless someone here has experience)