On the hunt for just a few, have some for trade at the bottom of the post.
*** = trade pending
DONRUSS Error/Variation Cards Needed
1988 543B Morrison COR (decimal INCLUDED in career bat avg)
1989 600B Checklist 578-660 (635 Curt Schilling spelled with a C, MVP's not listed)
1990 100B Checklist 28 - 125
1990 200B Checklist 126 - 223
1990 300B Checklist 224 - 321
1990 400B Checklist 322 - 419
1990 500B Checklist 420 - 517
1990 600B Checklist 518 - 617
1990 639B Jack Morris COR (no black line crossing the J in Jack)***
FLEER Error/Variation Cards Needed
1981 645B Mike Schmidt COR (card # IS on back)
1988 113B Garth Iorg COR (not Iorq)
1990 353A Dave Martinez (yellow '90 after Fleer on front)
TOPPS Error/Variation Cards Needed
1980 387A Fred Stanley (name in yellow on front)
SCORE Error/Variation Cards Needed
1989 654A Wade Boggs (seaason mispelled in text on back)
UD Error/Variation Cards Needed
1989 659B Jose Canseco (blue eagle in emblem, not black)
ERR/Variation cards for trade:
1982 Topps George Foster AS (No auto on card front) 342B
1988 Topps Al Leiter (photo is Steve George) 18A
1990 Donruss Juan Gonzalez ERR (reverse negative) 33A
1990 Score Ryne Sandberg ERR (3B on front) 561A