I went to my local glass store, and they told me they could order a piece of tempered glass for $25. I went ahead and just bought one from Ultimaker because the US glass thickness sizes were different. They only came in 1/8" 3/16" 1/4", etc. but the Ultimaker glass measured different (can't remember off the top of my head).
The only reason I went ahead and got the Ultimaker glass is because I only needed one, so when I changed the bed out, I didn't want to recalibrate it.
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gr5 2,265
Local glass store?
I don't recommend this for heated bed. It's not necessary. You can use regular glass as long as you give it space to expand. Also don't throw water on it when it is at 100C as that will likely shatter the glass.
Regular glass is cheap enough that you can buy 10 sheets of regular glass and that will last you 10 years of printing versus one sheet of pyrex glass.
Even Ultimaker doesn't use borosilicate glass for their heated beds. I think they use tempered glass.
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