Bbt and cvs

I am so angry. This is the second thermometer I have bought from CVS for bbt. The first one i bought was just a basic $5 one it crapped out on day 15 would not turn on. Then i decided to buy another from there (because I can't find them anywhere else) i even went fancy with it and got the $30. Won't turn on this morning.

I am so irritated because remembering bbt every morning same time isn't always easy and then to have a thermometer that cant even work for 1 month is pretty F***ing stupid.

Anyone recommend a good bbt thermometer. I use CBDA opk. But i dont know if I trust it or not. As this is month 11 ttc and well still not pregnant and doubt this month was any different.