I've been wanting to do one of these for ages and since my laptop while a normal size on it's own, with the extended life battery fits in *nothing* I decided to go ahead and use this http://sewmamasew.com/blog2/2009/05/elizabeths-fabric-focus-5/ tutorial to make my own sleeve ... I had all the supplies already (hooray for my supply hoarding) so cost = $0. Aside from a measurement error which forced me to seam rip half of the flap after it was already completed (but before attaching it) I think beginning to end it took about 2-3 hours (my measuring mistake easily took an extra hour so I am not counting it). My machine definitely protested in sewing through the final layers but did it without jamming or anything with a little coercion. I didn't use the fusible fleece as the tutorial suggested though it would have been nice. Normal fleece worked fine too.