Buy.com has Memorex 5 Pack DVD+R Media for $15.86 w/ free shipping. That comes out to $3.17 per disc. Here is a link:

Buy.com Link

That's the best price I've been able to find for name brand media. If you want generic stuff, I recommend Rima.com. They sell Ritek 10 Pack DVD+R Media for $25.00 + Shipping. That's $2.50 per disc and their shipping is only about $4.00. Save on shipping by ordering 2 or more, they only add about $1.00 for each additional order.

Rima Link

I've read several posts on other boards from people that have had great success with Ritek. I personally prefer the name brand stuff though, so I only use Memorex. Plus I Really like the fact that Memorex puts lots of lines on the front of their media so you can write neatly on them.