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.... I don't see any listed in any local automotive stores. .......... Seems kind of small and kind of expensive. .....
Exactly why you don't see them in local automotive stores. Too much of a high-end specialty item.
If you want to buy one over the counter locally, look up fire extinguisher sales, service and repair shops in your area. (If you can't find a shop, ask your local fire department where to find one.) They probably won't have them off the shelf but can most likely order one.
Otherwise, google around. They're available through motorsports suppliers.
pc
While I have an extinguisher in the car - and my car isn't worth a Lambo, I have to say in case of fire I am standing well back and watching it burn. I love my car and have wrenched every nut and bolt but between gas tanks and the general futility of restoring a burnt car, I will console myself with the knowledge that it is for this very reason I carry insurance. Burn baby burn!
While I have an extinguisher in the car - and my car isn't worth a Lambo, I have to say in case of fire I am standing well back and watching it burn.
If you have an empty one and grandkids: make sure all the poweder is out, fill it half full of water, shoot less than 125 psi of air pressure back up the nozzel with the trigger depressed, release lever, stop air, hand to kids and watch them soak each other down. Those things will spray water far!