I am using regular glass on my build. I run it as high as 100c, although mostly in the 80c to 90c range. One thing I did with my build is use an aluminum heat spreader, It is necessary for me because the bed is much smaller than my glass (I used a round mirror), you may be able to get away without the heat spreader. I also use thermal paste between the bed and glass to ensure even heating.

I find that proper thermal transfer prolongs the glass life-cycle as it provides even heating, therefore less shock to the glass, and less likely to crack. You can buy a piece of glass and a glass cutter for less than 10$ combined and cut 2 or 3 pieces out of the same glass piece. Just be careful with the edges.