Does anyone know of a good sequential shifter (not paddle shifter) that will work standalone?

The two I know of are:
Frex GP Shift+ (http://www.frex.com/gp/shifter/index.htm) - not sure if it works standalone
Virtual-GT Sequential (http://www.virtual-gt.com/purch_acc.html) - not sure if it can purchased separately from the cockpit

Are there any others?

The Act Labs shifter does have a sequential shifter plate. Much cheaper than the Frex and VGT one too.

hey, i have that shifter I think I've only used it twice, hah. It may have a sequential shifter plate, but I wonder if it feels realistic... otherwise I might as well use the G25 one.

hmmm... time to dig it out of the closet.