Make sure you get borosilicate glass. Normal window glass WILL blow apart at ABS bed temperatures. And it is a mess and can damage the silicone heater too. Not worth the temptation to go heap. And don’t think that getting a thicker piece of window glass will prevent it, it does not. In fact, it is worse since the issue is thermal stress.
I googled 12" x 12" 3D printer glass and found a number of other sources. I did not check shipping but it’s a place to start. A piece of 12" sq CAN be shipped in the US with USPS Large Fixed Rate Priority for $15. I don’t know why more businesses don’t take advantage of that. Maybe one of the other sources does.