All of this is including shipping-
Host-47
Microboost-25
copper heatsink-12
diode-50
lens-10
aixiz module-2.5
total-146.5
extras (thermal materials$7+case$8+goggles$8+AW 18650$21)-$44
total-190.5
And as for what you said, you can't really use an lm317 driver in a flashlight host.... I HATE labbie hosts, your $100 price would make sense for a labbie. The cheapest handheld I could think of would be in a pen host, which would end up being around $100 probably.