hey TT,
would you care to say where from?

OK, where to start:
GSF do Fuchs Titan GT1 LongLife III 5w30 504.00/507.00 in 4litre packs @ £8 +VAT per litre. (
http://www.fuchs-oil.de/home_en.html)
John Clayden & Partners, 9 Frensham Road, Sweet Briar Industrial Estate, Norwich England NR3 2BT Tel : 00 44 1603 789924, Fax : 00 44 1603 417335 - do two different 504.00/507.00 oils:
Castrol SLX LongLife III @ £8.14 +vat per litre for a 60 litre drum, or
Elf Solaris LLX @ £5.20 +vat per litre for a 60litre drum, or 4x5litres for ish£5.70 + vat per litre.
I do have one other "trade" supplier, but I can't post those details, nevertheless, the price is there, or thereabouts what John Clayden quoted.