If you are just a member of the public I'm not aware that it is actually possible so cost doesn't come into it. Publication of R/T transcripts comes under the WT Act and authority is unlikely to be given unless you have some serious professional requirement.
Radar "tracks" are available on-line for certain areas and there is always the commercially available SBS gadget which displays aircraft transmitting ADS-B information on a type of radar display on a PC.