dont buy one of those overpriced relics, unless you're just interested in collecting the hardware or something. I don't really see how they can justify those prices when you can get a much better spanking new proper 128mb accellerator for less than a 4mb hawk or something, anyway.
you can run some older games, ones that came on a single disk for example, i think though that most (i'm assuming over 50% but perhaps more even?)games wont actually run on a 2mb amiga - the preloaded cards from ebayers don't cover this point at all, its all very misleading if you're not doing the research into it.
for a proper WHDload rig that will run anything you throw at it, you need at least the 128mb accellerator (yes all that ram is useful, for example, running the 'talky' cd32 beneath a steel sky from CF) (£80?) an adapter and decent CF (maybe 15 total - you can get cheaper from china, but thats what you'll pay for guaranteed amiga compatibility on ebay/uk stock - you'll also have to configure this and load all the WHD load games on yourself) and a WHDload license (another 15) without the license, a few games are crippled or wont run.
so £130 minimum, if you wanted to save some time and get a preload thats £145, (the preloaded cards don't come with a WHDload license either) though that gives you access to a huge library, you could do all that on a fairly old pc with emulator for just the cost of WHDL license but wheres the fun in that.
the other way is to get a device that will store and load adf images, a floppy emulator, that you install in place of your floppy drive, allows you to load stuff from virtual floppies, your amiga can't tell the difference.