I was/am only concerned with the GXP, not all Solstice convertibles. (This is serious as I have several beers riding on the numbers!) I got the number from this website, not sure how accurate as I have a devil of time getting hard GM data.
Modern collectibles revealed: Pontiac Solstice GXP and Saturn Sky Red Line | TFLCar.com
Between 2006 and 2010 there were around 62,000 Solstice Convertibles and around 1,200 Solstice Coupes produced. Now, lets zero in on the GXP variant. Out of all Coupes produced, 781 were of the GXP flavor. And there were around 13,000 Convertible GXP examples. Since, Pontiac no longer exists, we can be sure that these numbers will stay as they are.
Itís safe to say that the GXP Coupe has the needed rarity to qualify for the collectibility formula. Whether, the GXP Convertible qualifies is more up to debate. In the case of the convertible, more break down maybe needed: a rare year, a rare color or manual versus automatic transmission, etc.
Between 2007 and 2010 there were around than 34,000 Sky Convertibles produced. Out of all, approximately 12,000 were the high performance Red Line version. This number still looks a bit high, so a further breakdown may be necessary. For example, there were around 1,300 Red Lines produced in 2009, and this number makes this year more desirable.
How good are these numbers??