I'm planning ahead for some counter experiments using 7 segment displays. The shear number of display types is extremely large, unlike CMOS logic types. I bought some MAN74A, small common cathode LED displays, but it occured to me they might not be the most common kind out there (though I have seen them for over 30 years kicking around). What kinds of display components are available in your area? I'd like to get something that is available everywhere.