Re: £120 for 4MB
A whole megabyte? Kids today etc.
I remember buying (or rather, my dad buying for me), a 512KB upgrade for my Amiga 500, which was about £60 if memory serves.
We bought it from Evesham Micros, who were basically operating out of a double garage at that point. Little did I know that I'd end up working for them some fifteen years later.