Starrett wants $98 for that little gem. I don't care how much easily broken glass you add, it's still a little hammer and that's a ridiculous price for same.

https://www.starrett.com/metrology/product-detail/815

This quote from the above...

"This is a very practical tool that is just as much at home on a toolmakers bench as it is on a businessmans desk."

goes a long way to explaining why their prices are so excessive.