This is what we issue to our officers:
Regular OC that we use in LE will only spray out a few feet. You DO NOT want to be close enough to a bear to use LE OC. The bear spray is still OC but it will spray out to 30 feet. Remember the 20 foot rule for someone attacking you with a knife? Bears are quicker.
You can pick up bear spray at Cabelas, Bass Pro, REI, Eastern Mountain Sports and it's not that expensive. If you want to cheap out and depend on what you carry on duty make sure your will is up to date if you are going into grizzly country.