Hi,
Note sure what you are after here. I think most people either had their bar fitted or it came with a kit so I don't think kits are in big demand separately to bar. ARB US are probably just quoting the shipping time via sea freight with their next order from ARB Aus.
Guess you could try arb factory here in Aus direct at
www.arb.com.au. They have their contact details there. Maybe they will ship air freight direct to you?
Cheers