I'm not sure what "prototyping filament" is, but this appears to be a pretty good price for basic PLA. Reviews appear to be ok.
Also available in:
White - https://www.jaycar.co.nz/creality-ender-pla-1-75mm-white-pla…
Grey - https://www.jaycar.co.nz/creality-ender-pla-1-75mm-grey-pla-…
Overview
This filamant is from a recognised manufacturer and is so cheap you can use it for everyday Protoyping without breaking the bank.
It is PLA so will not run well at high speeds but is well suited to slower speed printing.
Creality Ender-PLA filaments are suitable to use on your FDM (Fused Deposition Modeling) 3D printer with little to no change to your regular PLA settings.
PLA (modified PolyLactic Acid) is extracted and purified from corn grain for an environmentally friendly composition. It is low odour and users report a slight, sweet aroma while printing.
Features:
Affordable and Cost Effective for Beginners and great for prototyping
Good Compatibility, Simple Operation
Neat Winding, Less Tangle
Stable Wire Diameter, No Clogging
Biological Material, Environmental Friendly
Printer Settings:Printing Temperature: 200-220℃
Bed Temperature: 0-70℃
Recommended Printing Speed: 50 mm/s
Movement Speed: 90-150mm/s


They used to be $17.90 each, also don't know what do they mean by "prototyping", recent reviews seem good will get a few.