K31 turbine housing options

[SoDak24valve]

I know the k31 turbo is kinda old school and out dated charger but I am looking for other turbine housing options that are available for that charger something in the t4 .90 or 1.0 range. I know Ats will machine me one but they are pretty expensive . Or if there is a manufactured housing like a s300? that I could just machine out larger for the k31 exhaust wheel. Thanks for any info, can pm me also.