Sony 10 Pack 60 min DVM Premium is just £11.78 @ Amazon
Cheapest price I've noticed for Sony miniDV tape. Free delivery on all orders over £15.
Description : 10-pack MiniDV Premium Tape - 60 min. Bringing you exceptional picture quality, great resistance and excellent value for money, MiniDV Premium is an ideal tape for everyday use.
Features : Perfect digital picture with a resolution that exceeds 500 lines | Infinite range of possibilities to edit and share your videos | Possibility to record up to 50% more in LP mode