wanted: small permanent magnet

Hello,

I'm an engineer with an interest in NMR experiments in my home lab.
I'm looking for a small homogeneous permanent magnet assembly, on the
order of a few centimeters, for benchtop experimentation.  I have
ordered some neodymium magnets from Ebay, from which I will attempt to
build an assembly, but something like the permanent magnet which used
to be offered by metrolab would be better.  Does anybody have an
unused small, homogeneous permanent magnet they might be willing do
sell cheaply or donate?

Thanks,

David.