RitekG04 are usually a good price and probably umong the best of the "cheaper" class of media. It is also widely available.
Buy in smaller batches to ensure the media works fine with your drive(s) so you don't get 100 pack of lemons for example.
Keep in mind "cheaper" media can of course vary from batch to batch.
My picks would be Taiyo Yuden (TY) <-- expensive, MCC, Maxell, Ritek/Ricoh and CMC in that order.
If you are looking for anything "cheaper" I cannot in my right mind recommend any. Ultra-cheap media is just not worth it imho.