Complete series 2 of Tenko (region 4) for approx £10.38 including delivery from EzyDVD in Austrailia. (AU18.03 + AU$4.50 p&p).
Cheapest region 2 price is £34.99 from Amazon.co.uk - a saving of £24.61
This is a pre-order which will be sent out after the 2nd of April.
They also have series 1 & 3 which are not quite so cheap, but still far cheaper then the region 2 sets.
I've ordered quite a few DVDs from ezyDVD in the past and they are very reliable. Takes about 1-2 weeks from date of dispatch usually.