Re: R2 S4.5 "Final Season" DVDs (Amazon.co.uk)
It's definitely worth waiting. I did it for season 1 - 3. But I couldn't wait to re-watch S4.0 so I picked it up immediately :-D. But I agree that £50 is way too much for one season.
"For everyone lost in the endlessly multiplicating realities of the modern world, remember: Philip K. Dick got there first" - Terry Gilliam