Why encourage your students to read worthless books by complete strangers, when you can insist they read worthless books by your fellow group theorists?
As well as telling your local University bookshop to get 100 of each, you may wish to invite your students to order their copies directly from Springer (or Springer USA). If UK based students want to order directly, it is simplest for them to e-mail sarah@svl.co.uk or sales@svl.co.uk or phone (+44 1483) 01483 418822 and talk to her directly.
If lecturers want inspection copies, they should contact sam@svl.co.uk and she'll be happy to send them out.
Their exact prices are: DM 44, UKP 14.95, FF 166.00, Os 321.20, SFr 40.50, Lire 48,590 and US 29.95.