I'd like a model number and the name of a vendor where I can purchase
a slot loading combo drive (DVD/CDRW) that can be used in a PC.

While the slot loading combo drive is very frequent on the Mac side of
things, it's almost unheard of in the PC world. There are many slot
loading single-fuction drives, most notably the Pioneer line of DVD
drives, but there are no combo drives for the desktop. You will
however find the slot loading combo drive in use in many laptops. I
know this isn't the answer you're looking for, but if you find it
acceptable, please let me know. Also, maybe another researcher can
find a part which I am not familiar with.

skermit-ga

I'm aware that they are indeed rare but are out there. The  Matrix VPR
uses one http://www.zdnet.com/supercenter/stories/review/0,12070,562402,00.html
as does this sleek looking thing
http://www.soldam.com/barebone/polo_r/detail.html however I still
can't find an actual part number or a place to buy one.

I realise they are both laptop drives but I can make that work pretty
sure there aren't any desktop combo drives out there

Um... did you fully read my comment? I know that there are laptop
combo drives. That's just it though, on the PC side, there aren't
desktop drives. There are Mac combo drives, it's standard with all of
the latest Macs actually.

skermit-ga

I did read the comment and what I'm saying is that I can make a laptop
drive work in a desktop but I still need a model number and vendor for
a slot loading dvd/cdrw combo drive.