Roger,

All I did was take a business card into a local glass shop and explain that while they do chip epair also, I dont do replacements so... if I could bother them for a piece of broken glass (that gets thrown away anyway) I would in return be more than happy to refer some customers their way.

Some may say "no" simply becase you are a competitor but most times they wont mind because its one less piece of glass to pay for the disposal of.

as far as doing a demo goes, Id say if a full window is too big simply break it in half

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