It might sound a little redundant (or even 'old news') but having just downloaded them myself I've added a link to the contacts page on the Slammer's site hammers-slammers.com/contact.htm to point people to the Kindle editions of the Complete Hammers Slammers books Volumes 1-3 (both Amazon.co.uk and Amazon.com).
These are Kindle versions of the Nightshade Publications books and contain every 'proper' Slammers story to date* but note that they are the paperback versions rather than the hardback versions (certainly the ones I downloaded were anyway) which, whilst the text may well be exactly the same, means no internal illustrations.
By which I mean my illustrations which featured in the hard backs do not appear to be present.
Oh well :( Anyway, Hardback, paperback or Kindle, they are still the best way to get access to all of that material: they have a short story in each which is unique to them and even if you have some or most of the material elsewhere they are, in my humble opinion, worth buying for that material alone.
John Treadaway
* Just a reminder that the collection does not include the excellent Forlorn Hope currently not available on Kindle (as far as I can tell) which, Dave Drake has agreed, can be contained within the Slammers Crucible Rules universe.