Yes they are rare. When I bought mine in '01 it was the first time I had ever seen one. I was looking for either an SSEi or a GMC Yukon GT. I found a Yukon GT at a dealer but they wouldn't negotiate. At the same time, a friend of the family who happened to work for a Pontiac dealer, told me that he had brought an SSEi in on trade. Well, it was an SE with the SC option. I almost didn't buy it because it wasn't an SSEi (in my opinion one of the few plastic cladded pontiacs that look great). When the Yukon GT fell through, I took a second look at the Bonneville. Then I test drove the beast and fell in love with it. I like the sleeper look with the killer engine combo.
After I bought it, I started looking around for other SESC'*. I have only seen three other examples, two '95s in Kalamazoo (a university town with a lot of student turnover) that I haven't seen since, and a '96 in one of the threads here on Bonnevillclub.com.
I guess most people looking for the SC opted for the fully loaded SSEi. I guess if you are in the market for a new SC car you can afford to go with the top of the line. This means that there aren't many out there. I have also looked at Autotrader.com and ebay for any non-SSEi SC Bonnevilles--to no avail.
Retired Moderator, The Bonneville Club www.bonnevilleclub.com
RIP Oldsmobile, April 29
1995 Bonneville SE Supercharged (Stock)
Current Mods: Dirty GYM Sock air freshener.