The F-117 TrueRife frequency generator is probably the single most affordable powerful generator on the market. I know and talked with PERL company. You have to purchase different numerical handheld devices if you want to run additional frequencies and that in itself is very expensive!
Whereas the TrueRife you can get along just with the generator/software/dbl bubble accelerator for around $3600.00! Of course if you want the GSR-II Scanning module that is around $600 extra dollars and I know of no other company that has such a detector on the market that can scan your entire body and create a counter act program to balance said issues found! Unless you want the F-scan and that is around $4000+.
Where as the GSR-II is only $600.00 additional fee.
It boils down to how easy of operation you are wanting! And if you like daily or weekly or monthly updates to experimental frequencies that others had success with. i would love to see a comparison of the True Rife Generator verses Perl for total costs and ease of use and flexible for just about any type issues.