here's Fluke's massive selection of replacement leads http://us.fluke.com/usen/products/category.htm?category=LEAD(FlukeProducts)&parent=ACC(FlukeProducts)
for the record I have a T5-1000, I was a little bit worried about it having permanently attached leads, with the probes being bannana-plugs, but I've had it for a little over a year now, and they're still gripping strong
edit: here's a supplier:
http://www.testequipmentdepot.com/fluke/testleadsprobesandclips.htm-Will