Hello all. This is about knapping glass, but I had a look at the 'cavemen only'  bit and that seemed to be about stone age items not associated with knapping and so I thought that this was the most appropriate place.
During one of my youtube sessions of self education I found this idea.  
http://www.youtube.com/watch?v=SfMN3BVISmQIn the video the man is knapping glass from a beer bottle instead of flint.  I instantly wanted to try it as I realised that this was an excellent way for me to get into flint knapping as I woudn't have to waste flint on beginner mistakes.  i also could start to learn the craft straight away, rather than having to find some flint.  I can just keep my eye out and when I do find some then hopefully I wont waste it.  
Id love to give it a go, however I haven't got any of the antler tools needed to begin the work.  Ive had a rather fruitless search of the internet and I coudn't find any where selling antler knapping tools.  Because of our hunting laws I think they are very rare in my country (uk)  
If anyone could post me a link to somewhere selling antler knapping tools I would be most grateful.  As well as  any other advice you fine people are  willing to impart to a complete beginner, like does glass knap the same as flint?  How does the hardness and sharpness of knapped glass compare to flint?  What kind of target is suitable for a stone or glass arrowhead? 
thanks for your time spent reading all that! 
 Sam