The Circa brand had just a three year run. The Fleer product came out in 1996 and 1997. In 1998 it was renamed Circa Thunder. The sets ranged between 200 and 400 cards.
MVP was an Upper Deck product release between 1999 and 2005 (though skipped in 2004). The sets weren't super-huge and will add 55 cards to my Cubs collection
These last two sets go hand in hand. SP came out from 1993 to 1997 and netted 34 more Cubs.
The brand got an upgraded name in 1998, now known as Authentic and the set continued to be released through 2009, which was Upper Deck's final year with an MLB. license. Twelve years worth of Authentic will bring me 77 Cubs, an average of just between six and seven per year....not very many.
I'll start showing the cards once I get them in hand and scanned. The untruthful Sportlots dealers have slowed down the process.