Trumpeter is releasing additional B-25's in ten-packs. They just hit my local hobby shop last week. You'll have several surplus ones due to the fact that you only need 16 (shrewd marketing decision on somebody's part).
I just picked up a ten-pack each of TBD Devastators and F4F Wildcats for my own Hornet (which will be built as Yorktown).
Paul
"A man's GOT to know his limitations."