i bought a leftover sony vaio case (black neoprene) for seven bucks at a microcenter store bargain bin. i'm wary of products that state "fits most __-inch screen laptops", because they usually don't fit the 12-inch or 15-inch powerbooks. i found that out the hard way when i ordered a nice Booq bag for my tibook and ended up returning it; check out the dimensions, the numbers don't match up. the sony fits my 12" PB corner to corner with about 1/4" thickness to spare, i usually pack a magazine to make up the differrence. it fits my 12" iBook skin tight. i find it most annoying when my 'book rattles in its case.