The best price I have found was a e-mail quote from these guys. I have not called more but it seems that the shipping bots can over charge international orders so it's best to call.
https://baitplastics.com/
$174 usd for a 5 gallon bucket shipped
I was getting alumisol from PM HobbyCrafts as a special order, but it's been a nightmare lately getting that across the border.
The do-it plastisol is too soft for pike lures.
Nice bait BTW where did you get that mold? if you have not found it already here is a youtube channel , he does some cool stuff with that mold.
https://www.youtube.com/watch?v=Ao3dggUqYig&t=775s