I bought a case from Wal-Mart for $10. It's comfortable and holds the blackberry (sideways) perfectly and snugly.
The magent in the cover did nothing for the device shut-off, so I modded the holster.
- I took an old full-sized drive apart and took the magnet out.
-The magnet is loosely attached to a large piece of metal. I put it in the vice and tapped the metal off of the magnet.
-I took two pairs of pliers and easily broke the magnet into 4 pieces.
-I took two of the biggest pieces, cut slits on the backside, of either end, of the case, just big enough to slide the magnetic pieces in.
-I primed a small area around the slits with PVC primer (clear)
-I took a small dab of PVC cement (AKA GLUE for those in another thread) and sealed the slits.
Not too unsightly and besides, it's on the belt side of the holster. The device can go into the holster in any orientation and it turns off. The smaller pieces of magnet make it less likely that it will (if it was possible) erase any data.
Works %100