I got some clear from Monoprice that is running well. I've had good luck with stuff from Microcenter also. Clear ABS isn't 100% clear, more like translucent.

There is no way around a flat glossy bottom of your print when using glass no matter what you use. That slurry layer is fused solid or should be. That said, I have mainly been using glue stick, but even then the bottom is a different texture than the rest of the build up layers. This is because of how the first layer gets smashed into the bottom surface.