Pinball players ask me how my glass compares to invisiglass or PDI glass. The best answer I have is: My glass is such a huge improvement over regular pinball glass that there is no need to look any further for glass improvement for your pins.
3/16 "Super Clear" $85 each
1/4" "Bob's Ultimate" $110 each
Shipping and packaging averages out to about $50 give or take.
There is no need to spend $300 for glass!