Hi Vicky,
You could try Ward's Natural Science in the USA http://wardsci.com . We have used them in the past to buy teaching material (rocks, minerals & fossils). I see they also sell some thin section sets.
Cheers,
Neville
Neville Hudson, PhD
Collections Manager
School of Environment
The University of Auckland
Auckland
New Zealand
http://www.environment.auckland.ac.nz/
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