I could take pot luck and buy a vamp blister pack for £6 which contains a random vamp and two thralls. I think that has to be the way to go, try and trade any duplicate vamps for the vamp 4 I need on here or something.
£5 each? Why? Let's get some perspective on this. I know that's the going rate for Stars and I'm fully aware of GWs policy of charging more for characters rather than stock troops in other systems, but these are team players. Any of the new Elves for example are listed at £2.50 each. A two part Saurus works out £3.50. A Rotter is £2. A Khemri mummy is £3. Yet 3 of the 4 vamps are priced the same as Star Players at £5 while the other one is £2!

Notice the Dwarf ref has lept to an amazing £6?
Nurgle blister packs give you a random rotter and a random beastman for £7. Yet you can get any specific beastman or rotter for £2 each.
WTF is going on over there? Who is making these decisions? The mind boggles.....