No way! Nobody can get even a simple mask set for under $100K. And, I doubt you can find any fab that will do 1 um or larger process, there just isn't any demand. The various services that can do these combined runs have specific processes and design rules they will accept.
Jon
OK, maybe I should expand on this. We use the ON Semi C5 process (used to be AMI semiconductor). It is a fairly advanced mixed-signal process, perfect for the stuff we are doing. It does have quite a few more layers than plain CMOS, so high resistance and high capacitance layers can be fabricated. This does drive up the cost of the mask set. But, it sounds like this is the kind of process that the OP might need, anyway. The C5 process is NOT designed for bipolar, the only bipolar function we have is a band gap reference. People have fabricated other bipolar parts on it, but those parts are not in a library we have access to.
The chips we are doing have very roughly 100K transistors, so quite a bit larger than the OP's project.
Jon