The Roland CX-24 is one generation out of date but should have come bundled with Roland CutStudio software. I do not think the CutStudio software is sold separately but you might want to inquire with
your nearest Roland dealer.
Other proven solutions include the CiberCut Pro I linked you to earlier along with other solutions such as
Co-Cut Pro which requires CorelDRAW and WinPCSign available from
GRS at a special price.
I won't try to dignify your query as to the "best, cheapest" software. That is an oxymoron. You get what you pay for.
CiberCut Pro Version 6 Max currently is being offered in
an ad right here at a buy it now price of $295.00.