I actually found a very cheap alternative to Tamiya Insignia White... it comes in a 32oz spray can and only goes for $3.95 a bottle. You only need 1 bottle for the entire ship! It's Krylon Maxx Ivory #8980... I tested several colors and here's my results:
These are the colors I tested
I painted each color on a color chip card and allowed it to dry and then compared the colors on the unpainted hull. Here's what I found:
So it looks like Ivory is the winner! I painted the top turret completely and then placed it against the unpainted bottom hull.
Looks like a very good match. I did a little light weathering on it and then took it outside in the sunlight. I think that this will do quite nicely.
Oh yeah baby... that's the sweet stuff. So I'm going with the Krylon Ivory and the sweetest thing about it is that it's a very common brand that can be found just about anywhere and one can should be cover not only this whole thing, but half another one! I did a little preshading on my lower hull and then painted over it. It looks really nice so far!
Hope this helps those who are having such trouble finding any of the Insignia White. This stuff looks like it's a pretty good substitute!