New this week from Games Workshop are the individual box sets from Betrayal at Calth. Betrayal at Calth is still available on the GW webstore, but if you need to pick up one extra of something, this is a good way of doing it.
Here is the the latest pre-orders from Games Workshop
Cataphractii Terminators £40
Contemptor Dreadnought £35
Space Marine Heroes £30
Mark IV Space Marines £30
If you still want all of these together, you can get them at this link
The Horus Heresy: Betrayal at Calth £95