OS and some other stuff

I'd say

1) 5-10e if you find a buyer

2) merch (q12 martial)

3) Maybe 15-20e with luck ?

4) merch (1 useless mod and HCT 9%)

5) 5e

6) Not sure but I think xxe
7) merch - 5e (probably the most common skin ?)

merch all except n1 n5, few e each for them