Grading Kellogg's 1-Card Packs

Has anyone sent one-card packs to get graded?  How much does that cost?

I own some PSA cards due to purchases that had a few included, but I don't own any PSA-graded packs.  Has anyone picked any up?

Here is what I found by checking the PSA population report.

Baseball

1970 - 36 graded.  Clemente has the most - 3.
1971 - 31 graded 6-card packs.  No player has more than 3.
1972 - 10 graded with 6 being Clemente.
1973 - 09 graded with 3 being Kaline.
1974 - 06 graded.  Six different players.
1975 - 02 graded.
1976 - 04 graded.
1977 - 01 graded.
1978 - 18 graded.  Three Nolan Ryans.
1979 - 01 graded.
1980 - 01 graded.

I didn't see any All-Time Greats from 1972.  Two Rold Gold cards from 1970 have been graded.

Football

1970 - 4 graded.
1971 - 26 graded.  No player has more than 2.

I didn't notice any on SGC.  Are people using BGS for these cards?