opam
is maintained by OCamlPro, why not contact them and get a
quote ? It won't be 300$, but everybody
will enjoy the feature in the next version.
As
a side note, a long time ago, I had an implementation of a
binary cache for OPAM. The modifications
in OPAM were minimal: opam would
just
call a hook to build the package and install it, providing
a checksum of dependencies and
sources. The checksum would be used by an external
tool (`ocp-bin`) to query the local binary cache (or a
remote server) and either re-install the
package or build it and save it in the cache.
Since it was written in 2013, not sure if it would still work
easily with current opam. Its code was used later to
create opam-builder.
--
Fabrice
LE FESSANT
CEO
Origin-Labs SAS & Dune Network
Fabrice LE FESSANT
Chercheur en Informatique
INRIA Paris Rocquencourt -- OCamlPro
Programming Languages and Distributed Systems