My dad bought our first A500 from a local shop called Colchester Computer Center. I have no idea how much it cost as it was a Christmas present, and I was very young at the time anyway. My dad said that he took it to the station (he was a copper at the time) and set it up and he and his co-workers all played Nebulus, and they were all totally blown away by the graphics, in particular the rotating tower.
I still love that game :-)
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moto