Because of my high risk of sunblisters, I have to wear a high power sunblock on my lips. I used to be able to buy a very inexpensive tube, in white or clear for about $2. I cannot find it anywhere? I have searched the internet, but still unsuccessful in my search. Thank goodness I bought 5 tubes the last time I did find them, which was several years ago. I am getting low and need to find some. Any suggestions?