OWB versus IWB..
OWB- generally more comfortable if you have any excess "baggage" around the waist, barrel length becomes an issue, but shouldn't be one with the 908s, must wear an appropriate length cover garment
IWB- much easier to conceal because the barrel is inside the pants, so you only have to cover the rear half of the pistol, may be less comfortable than OWB if your jeans are already a snug fit
A good inexpensive IWB holster is the Uncle Mike's clip-on version. It's not as stable as a made-to-fit holster, but it would give you a good idea of whether or not you like IWB carry. Uncle Mike's also makes an adequate line of OWB nylon holsters than will do until you decide on a good leather or kydex unit.
If you want to go with a leather holster right off the bat, a good inexpensive line is the Don Hume brand. They are not a Milt Sparks/Lou Alessi quality holster, but are a good value just the same.
If you want to step up to semi-custom holsters(Galco, FIST, Bianchi, Aker, etc.) there are plenty of options out there. If you want to go up to a full custom there are also guys like Tucker, Alessi, Sparks, etc. that can hook you up with a high quality holster that will serve you well for years to come.
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