Like Sheringan, I bought a 512K RAM expansion for my A500 in early '89 and it cost about £90. (There was a RAM chip shortage in the late '80s, I think.)

I got my external floppy at the Commodore show in Hammersmith, November '89 also for about £90. (How can I remember all these useless details of my life and yet forget where I put my car keys five minutes ago!?) (I have actually still got a Commodore mug I bought there, although the red bit of the C= logo has faded to nothing after all these years. My wife thinks I'm very sad for keeping it...)

Anyway, floppies... Verbatim DS/DD jobbies were £1.35 for one, obviously cheaper by the multiple of 10. Or you could get no-name unbranded disks for about 80pence each.
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The first 5¼ disks by Elephant cost around 8£ at the time (1 disk!), which was enormous.
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If they were by Whale then they'd be cost even more.
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http://en.wikipedia.org/wiki/Elephant_Memory_Systems
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I remember paying (actually my dad paying) about £100 for the 512k upgrade for the A500. I remember one of the main reasons I wanted it was so that I could play Streetfighter which I had bought in WHSmith in Inverness on a family holiday for £10. What a dissapointment and waste of £10 that was!
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Coud've been worse... You could've bought a 1200 with hard drive and a memory expansion to play Rise Of the Robots. It would have made you suicidal.
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That explains Teho's outlook on life!
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I was going to say no no, it doesn't take that much. You only need to have bought just the game.
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