Best price for dual-layer recordable DVDs?

Factual Questions
1

Sorry for posting such a simple question in GQ, but I’m not sure where else it would go. Mods, please move it if appropriate.

I’m setting up a big file server for a friend’s business, and he’s going to be using recordable DVDs to do his backups. But one of the files they use is a giant 5.5GB database, and so I thought we were out of luck until I remembered that they actually make dual-layer DVD+/-R discs. (Since I never have use for them myself, I had forgotten they even existed.)

I went to Best Buy and got lucky on a 20-pack that was on sale for $29.99, but the sale is over now and their regular prices are more like $45-$50 for a 20 pack. Can anybody point me to an online vendor that’s significantly cheaper? I tried a Google product search, and the best price I found was here, at $34.99 for a 25-pack. That seems like a darn good price to me, but I’d prefer 4x discs instead of 2.4x if possible (it appears that only DVD-R dual layers are capable of 4x recording, but I could be wrong; in any case, either +R or -R will work fine).

So, does anybody else know of a cheap and reliable source for some dual-layer discs? Thanks for any help!

2

If the data is important enough to need to be backed up, then media quality is far more important than media price.

3

Yeah, I guess I should have specified that I’m looking for a source for regular Memorex or Sony or Verbatim media, or some other well-known brand. I’d prefer not to deal with ultra-cheap generic brands, for exactly the reason you specify. The link I posted is for Memorex DVD+Rs, but I haven’t had a problem with Sony or TDK or Verbatim either.

4

Really, I’ve found in all my time of buying recordable media is that you have to wait until the brand you like goes on sale and buy a bunch. I cruise the Sunday circulars for Best Buy, Office Max, Staples, etc and find great deals - except with no real regularity.

5

Far from being the cheapest but arguably the best as far as reliability goes are Taio Yuden discs.
Example

6

I looked at your link, but the only Taio Yuden discs were 4.7GB. I didn’t see any dual layer discs. Do they make dual layer discs as well?