Here you go:
http://cgi.ebay.com/12-DIMMABLE-Compact-Fluorescent-Light-Bulbs-15w-75w-cfl_W0QQitemZ230217869160
The seller, 6801goodbuy, delivers quickly via Priority mail and told me he would exchange any bad bulbs if they didn't work correctly out of the box.
I have to agree, the slow start is desirable in many situations.
BTW, this guy's prices fluctuate. Sometimes 75W bulbs are more expensive than 100W, sometimes not.
Edit: Link corrected...thanks Island.