Yeah it's the Miu Miu Bow Satchel in Aumirillo (or however you spell it) but it's from the old 2007 collection so it's RARE/SOLD OUT to get one you will have to check ebay.
it's a miu miu bow in allumino. it's from a couple of seasons back, so this color may be hard to find and it's quite popular as well. your best bet is ebay.
i've got this bag -- it's gorgeous and slouchy! i that she is carrying it around! that means i've got to get mine out of winter hibernation!
this type of leather is rare, as miu miu now only makes the shiny leather. def check for it on resale, maybe ebay, bonanzle, online consignment shops? there's a thread about consignment shops in the Shopping subforum, i believe. good luck!