In 1999 Topps released a brand called Action Flats. For a couple bucks you got a figure and a card. The cards were identical to the base 1999 set but an Action Flats logo was added.
The plastic players were made to mimic the photo on the card and they did a decent job with that. Players were shown in home uniforms and there are short-printed versions of the players in away uniforms. I've got the two Cubs, Sosa and Wood, in their home uniforms. I've yet to see the away uniform variation for either of them.
These were labeled as being from Series One, which has twelve players. Topps never issued a Series Two, or flats in any other year. This was a one and done.
Topps also must have made massive number of these because you can buy them on Ebay, 20 years after their release, for the same prince that they sold for originally. Mine were two bucks each.