Triplet or Doublet at decent price ?

Hi,

does anyone know of anyone (or shop) who can produce
a 90 mm f/10 doublet or possibly triplet lens
assembly?

I don't want to spend TMB prices ($2500+)...but if
it's a good custom job, I might consider it.

Thanks...appreciate any leads as well.

Kwang

http://www.apm-telescopes.de/products/apm_achro/tmb_achromaten.htm