Patience, grasshopper. Bill sells paint as a sideline, something to pay the bills when he's not gigging (which isn't often these days ). If you just have to have something yesterday, you probably shouldn't be finishing guitars--especially with nitro based products--since there's a bit of patience required there anyway. Find something else to do until the store reopens.
OR, you can buy powdered dyes or liquid dye concentrates and mix in water, alcohol, thinner, clear, whatever suits your purpose and make the product yourself. It's not hard. Look at woodcraft.com, rockler.com, stewmac.com, etc. in the US. There are always alternatives.
click