On 10-18-2016 10:23, Doc O'Leary wrote:
every year. Personally, I just buy the MicroCenter store brand in
whatever size $10 will get me, and it generally lasts until at least
the warranty runs out. It’s not a huge expense, so I don’t worry
too much about it.

Every time I think I need another (sometimes failure, but more often
size), I pay about the same as before and get twice the size.