having a look at BioShock Triple Pack, hmm only the first one is DRM free, do you think it's a value pack for £8.49, or should I wait, maybe they will turn on on GOG or a humble bundle.
The three Bioshock games were already part of a bundle
. As to whether you should buy them now or wait for the possibilty of a GOG release, the question is; do you want to play them now or eventually? If now then, by all means, buy them. If you can wait (possibly, for years), then you should wait.