Actually, twisted pair's main point is that noise will cancel each other out due to the twisted design and not exactly because it'll arrive at a different time.

Coaxials are superior in noise rejection except those with 95% braided outer shield and above, the braided outer shield has the capability to prevent noise from entering the signal(in the core in the middle)

Actually, the cheapest coaxial based RCA cables would be to get those used in Video transmission, namely, RG-6(less flexible due to single core) or RG-59(more flexible due to multi-strand core), but try to look for branded ones as they'll usually have a higher percentage braided foil.

Beldens or Canare are available locally at a decent price for these coaxial cables. It's waaaaaaaay better than the usual cheap stuff RCA available for RM30-50 usually