Hmmm hard to say… it is 4 years old software, but still usable. I see on amazon some sellers have it for $359 USD used. Which is crazy…
I assume this is for used, but I did also see some selling as new (don’t know how that could be) on amazon. Do you know if it is the pro or the basic version? There was a difference in the included components for Flash. Also there was academic pricing and the academic version was different as well (the splash screen will say education version). For the pro version non-academic £75 is probably good, but for the edu version £25 or the basic I would say £50. Honestly though I have no idea… it depends on how badly you need this.
Also be aware if you are a Mac user the Mac version is not Intel native if I remember correctly. Which means on current Mac hardware it will run in the translation/slower mode.