For the last two seasons the hardest to find for me:
AML/ML. AMR/MR DL/DC with SA, Very few have been available and even less with SA unless your looking 30+
The young that do become available tend to have no SA and 3* 32 Avg.
I do have a AML/AMC with SS, SA but he came off the scout list last season.
The odd triple position becomes available but again they are 30 some-things with low quality.