I've been wearing Sidi's for a couple years now (size 13/14 depending on brand), and found Performance was the best place (none of the LBS's stocked the larger sizes and were willing to get them just for me to try). When I was looking for shoes, I ordered all of the probable sizes +/- in the models I was interested, in-store delivery so no shipping, and returned the ones that didn't fit on the spot.