<scratch head> A Yugo is much cheaper than a Ferrari, but it may not fit the application (racing versus grocery getter). cp asks a valid question... what properties do you want/need?
If you can ditch the impact strength (for which there is no real substitute for the money), operating temperature, and inherent low flammability, just use crystal styrene, which is about the only "cheap" option.
A clue to the application would be useful to give some more informative replies.
In my opinion the OP has managed to create a question that is both ambiguous and unanswerable. If it is not a student post it certainly has the hallmarks of one.
cgelang
If you want useful input YOU need to draft a clear and concise question that identifies the required properties, you know, things like expected life, temperature, load, chemicals, abrasion, light transmission, UV light exposure and a few generalities, like it is used in a kitchen, or it contains electronics, it is used outdoors, it is used in contact with swimming pool or spa water etc etc etc.
Regards
Pat
See FAQ731-376 for tips on use of eng-tips by professional engineers &