This is one of my favorite accessories too! I also keep receipts, extra credit cards/gift cards, and notes in there. I also would put my ipod in it, but recently purchased the mc white credit card holder for my ipod nano....that (the cc holder) is another favorite accessory too.
Mine is my Antigua Pochette which I bought from Rodeo for $190 US. It's so practical; I just open him up, toss in my wallet, cellphone, keyholder, and a pen and off I go!
I love hearing everybody's fave buys! I only have 2 LV items... so the cheapest is the Damier Ebony French Purse that was AUD$770 - it was a gift from my hubby. At first I found it too small for me because I'm so used to bigger wallets but now I've discovered it's just the right size!