If your in the USA you can use http://www.supermediastore.com For Verbatims and Taiyo Yuden. I buy my Taiyo Yuden from there all the time. Plus they have a nice sale on them right now. 200Pack for $49.99 with free ground shipping. I live past half way across the USA and it only takes 2 to 5 days to get the media. They are pretty quick at shipping them.
What if you're in Ireland, is there any supplier here as that's a good deal on 25c on each disk! As i got 50 Tuffdisc for E15 but out of the whole lot i have 10-15? (i threw away the first few b4 actually countin how many would last the lot) Cheers as that would help me a lot!