Or buy 4-5 different pairs of shoes from different manufacturers, from an online source that allows returns (eg. competitive cyclist). Yes, you may have to pay return shipping cost on the 3-4 pairs you end up not going with (as one shipment), but saves you a lot of aggravation of hitting lots of stores (in my area, typically a given store is married to only 1-2 brands, so not much selection.. and forget about finding much in a size 48+). If you talk to one of their sales reps before ordering, you may even be able to negotiate free return shipping if they know what your plan is.