I have had my Streamlight Key-Mate for quite some time now and I am finally ready to get four replacement LR 44 alkaline coin cells. Are all LR 44 alkaline coin cells created equally? I am just thinking of stopping by a Wal-Mart and getting some, assuming that they even carry them, but then I decided to check here first, just in case there are some that are better than others or in case anybody happens to know of a killer price on these somewhere! Also, just in case I decide to get more of these for Christmas presents, is the Streamlight Key-Mate the best in its class or are there better similar lights at this point?