Ok, so my printer currently has an aluminum bed. I am planning to put boroclass glass on that (adhered with a Gino/Silicon heat transfer pad) for flatness, and then a PEI sheet on top of that to make the prints stick better.

So according to the RepRap wiki, and just about everyone else, 3M 468MP tape is the way to go:
http://reprap.org/wiki/PEI_build_surface#Suppliers

Doesn't seem easy to find that stuff though, Digikey appears to be the only place that carries single pieces and not 5 to 1000 packs... is there any other place I can get it?

I am a bit confused about application however. The RepRap wiki recommended just getting this single large sheet:
http://www.digikey.com/product-detai...720-ND/2649265

I was trying to Google everywhere for information on this kind of tape or installing PEI beds, and while I found several videos on the performance of PEI for printing, the only video I could find about installing it was this one:
https://www.youtube.com/watch?v=7QvZb8ej1aw

Who recommended the opposite, using strips. Seemed to be a lot easier to install it that way, but he was bending the plastic a LOT by installing it that way.

The only decently sized strips I could find for close to the price of the sheet was this:
http://www.digikey.com/product-detai...721-ND/2649266

Is this a good one? And is it it ok to bend the plastic like that in the video? After seeing that video, the tape looks pretty messy to work with, not sure how you would even use a sheet of it without getting bubbles or clumping everywhere, are there any downsides to using strips instead of a sheet? Do bubbles even matter or effect anything other than appearance? And finally, both at the end of the video, and 3M's PDF about the tape mention heat-treating the tape after applying it:
http://multimedia.3m.com/mws/media/1...1fl-9472fl.pdf

Is this necessary? Not sure how I would go about doing that if it is.