Alternative for Sherwin-Williams ProClassic?

Another long time (years and years) lurker, first time poster; you know the drill.

I have had my Panasonic AX200U (bought 3 years after reading the positive reviews here) hanging from the ceiling and projecting to a white concrete wall for years and finally found the time to improve the screen quality.

So, after hitting up the DIY Screen area and spending hours upon hours reading, I decided to start with the Sherwin Williams ProClassic Smooth Enamel Satin Finish Extra White in a 6260 UNIQUE GRAY tint (since I have some ambient light). Simple enough, or so I thought.

Much to my disappointment, I found out that the ProClassic line is not available in Central America (that's where my wall is). I have checked with every Sherwin Williams distributor in the country and the answer varies between "forget about it" and "maybe, if you wait 45 days for delivery."

I'm looking for an alternative starter paint suggestion which might be a little easier to find. I'm fine with a higher price tag but spraying or mixing more than 3 components is outside my comfort zone. Thanks.

I can probably get it shipped down here if it is not flammable. Would it be better to have it shipped already tinted or do the tinting locally?

Know any online sellers of SW paint perhaps?

I ended up buying some in Miami and shipping it down, should anybody want to know.

I had one coat of SW primer pained with a 1/4" NAP about a week ago and I had a second layer of primer and the first layer of ProClassic pained today. I am going to wait for it to dry for a few hours and then turn on the projector and see how it compares to my previous plain white wall.

What the typical number of coats needed? 2-3?