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The followingm aterial with the least electron mobility is:
(a) silver
(b) glass
(c) mercury
(d) doped silicom
2. when a negatively charged rod is brought near an insulated, neutral metal sphere, the sphere:
(a) is repelled
(b) becomes positively charged and is attracted
(c) becomes polarized and is attracted
(d) has no polarization or force acting on it.
3. the electrostatic force
(a) does not depend on the signs of the charge
(b) is only attractive
(c) has the unit of volt
(d) increases when the charge separation is decreased
They have perspex ones at the moment and one is broken. if i can get them my son will fit them in for me.
Ask any glazier for them, just give them the sizes and they can cut them to size, I have done this myself and if the panes are small they should be very cheap. they may even have some offcuts they can let you have cheaper.
just look in yellow pages for a local one.
I would look in the yellow pages for acrylic glass as it is a lot safer than glass and more durable perspex although expensive, i see that new greenhouses have acrylic glass now maybe its because the odd ball hitting them wont break the glass
Maybe try B AND Q or the Range in the Range when I went there the other day they seem to stock EVERYTHING!
Answer mine pretty please with a cherry on top 
uk.answers.yahoo.com/question/ind…
homedepot sells glass
Take the measurements and visit a local glass merchant. he will cut them for you … Should be no problem .