Here are some items you might buy on Ebay auctions:

Telescope Secondary Mirror .8 inch (Precision flat)
280667452314 0 Latest Telescope Mirrors AuctionsUS $15.99
End Date: Tuesday May-22-2012 8:54:02 PDT
Buy It Now for only: US $15.99
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Telescope Spider w/secondary mirror holder10"
280667454832 0 Latest Telescope Mirrors AuctionsUS $29.00
End Date: Tuesday May-22-2012 8:59:51 PDT
Buy It Now for only: US $29.00
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Vintage Criterion Telescope Brass Spider Parts mirror for Newtonian Reflector
Vintage Criterion Telescope Brass Spider Parts mirror for Newtonian Reflector
Paypal   US $20.00 		T2 T mount Mirror Telephoto Lens Telescope to Canon EOS EF DSLR Camera Adapter
T2 T mount Mirror Telephoto Lens Telescope to Canon EOS EF DSLR Camera Adapter
Paypal   US $2.99 		125 Telescope Mirror Mount
125 Telescope Mirror Mount
Paypal   US $45.00
The Universe in a Mirror The Saga of the Hubble Space Telescope and the Visiona
The Universe in a Mirror The Saga of the Hubble Space Telescope and the Visiona
Paypal   US $8.56 		16 INCH F 6 CUSTOM NEWTONIAN TELESCOPE MIRROR
16 INCH F 6 CUSTOM NEWTONIAN TELESCOPE MIRROR
Paypal   US $7,500.00 		MEADE 1000 MM TELESCOPE MIRROR LENS SPOTTING SCOPE W Case
MEADE 1000 MM TELESCOPE MIRROR LENS SPOTTING SCOPE W Case
Paypal   US $39.77