Buying online is fine. Just expect to wait a bit. I have a terrible boot selection around here. Sometimes I can't find my size (split between 7.5 and 8 depending on brand).
Order from places that have great return policies and you're good.
Endless.com only carries 32 and DC. They provide free shipping, easy returns, and free shipping back to them. I just got a pair of 32 Prions today and they feel like heaven on my wide feet. Feet so wide they get pinched by K2 Maysis boots which are also supposed to be wide.