I was in the exact same situation with all my glass out. I looked at buying some film from ebay...was just about to bid and then was told about metal film Vs cheap film.
The cheap stuff goes purple after about 6 months....not a good look.
Personally I don't think you will be better off buying some decent film and do yourself. If you took your glass to a pro and had them do it, would be the easiest and probably the best job.
I WAS going to do that.....but then no one could see my swanky interior....so I went without.
and a cheap part for a mini 
) and I feel much safer without the scratched and pitted 40 year old toughened glass. But supply your own rubber channel and locking strips, their stuff is not the correct profile.