I actually did this order. I have never ordered from Diapers.com before so I thought this was the perfect opportunity to try them out. $5.79 per pack is a pretty good price - I guess you could get them cheaper at CVS if they are on an ECBs deal - but the CVS diaper deals have been so blah lately.
Here's the low down - First time customers get $10 off any order of $49 (and FREE SHIPPING!). Buy 5 at the sale price of $10.99. Pampers will give you $1 off (see Cheryl's post). Then there is a Parents Magazine Mail-In-Rebate for $14.97. 5 packs of Pampers comes to $43.95 before the rebate and $28.98 after. Huggies will run you $44.95 pre-rebate & $29.98 after.
I'm pretty sure my 18 month old will be in diapers for well over a year, so I find it's good to stock up on diapers when the price is right. I probably have about 450 diapers on hand now - but we'll use them! Unfortunately, I had to add almost $29 to my monthly grocery tab! But it's worth it I tell you!
Also - I went through Cashbaq.com to enter Diapers.com since they'll give me a rebate. It's just a measly 1% (.43 cents! Woohoo!), but hey, every cent counts!