Right now, there's no way to know if an item has materia added to it when viewing it in the wards. For HQ items, a lot of us are adding a 1 to the end of the selling price for a +1, 2 for a +2 and 3 for a +3.
I propose that if we have 1 materia, we list the price with a 1 as the next to last digit, for 2 materia with 2 as the next to last digit, and 3 materia with a 3 as the next to last digit.
For example, I'm selling something for $5,000.
1 materia added: $5,010
2 materia: $5,020
3 materia: $5,030
HQ+1 with 1 materia: $5,011
HQ+1 with 2 materia: $5,021
HQ+1 with 3 materia: $5,031
HQ+2 with 1 materia: $5,012
HQ+2 with 2 materia: $5,022
HQ+2 with 3 materia: $5,032
HQ+3 with 1 materia: $5,013
HQ+3 with 2 materia: $5,023
HQ+3 with 3 materia: $5,033
Let's hope Square will add a system in the future that will allow us to see these additions without having to use different pricing methods.