Here's a selection of 98 different 1961 Post Cereal baseball cards. That's a good start on the 200 card set. 

Almost all of these were cut from the backs of cereal boxes. Two (Richardson and Covington) are Company cards, which were on perforated pages by team. They could be ordered from Post Cereal at that time. Some notables include Aparicio, Minoso, Bunning, Kueen, Wilhelm, Schoendienst, Snider, Hodges, Podres, Flood an Billy Martin. 

I provide scans of the front of 94 of the cards. I reached my limit of scans, so the last four cards are not shown.  The cards generally are VGEX and EX. There's a few that are less and a couple that are better. They are bright, generally well cut from the boxes, have minimal wear, and none have any writing or drawing on them. Quite a few have the black border showing. Please view the scans with the eBay Zoom feature and use your own judgment as to condition. 

Some cards have wax stains on the back because of the cereal bags inside the boxes. Most of the cards in this partial set have little or no staining on the back.

The raw cards cards (no sleeves) are in a card box and will ship with tracking. Please use the Cart when shopping. Thanks for looking.