PICy,
i really don't suggest you to buy any at EBAY. chances are 99.9% that you'll not be able to update it after if, of course, the disk you'll receive is working.

Too many people use this crapy site to buy for cheap.... that's o.k to save money i agree. but for a program like PIcBasic Pro... see this

http://www.melabs.com/support/upgrade.htm

i think that EBAY is agood place if you want to spend money on already used stuff (sale for new one for ¼ regulare price) As i say often, it's a good junk yard