I got invitations now from Rishworth and Parc, and an e-mail from Aeroprofessional which I suspect concerns the same position.
@ Moretimeoff: Pay is US$ 5.200 for B737NG F/O and US$ 5.000 for B737PG F/O.
@ menikos: I don't have any personal experience with Garuda. I'm in the process of getting in and will post my experience here.