I have a Very long large oval head ( apparently brain size doesn't correspond to skull size!) Thus have a pretty difficult time finding a well fitting lid.
If you fall in to the oval head camp, Prime has a great deal on the LS2 strobe modular, a lid known for its ability to fit egg heads, with a lot of features not found on lower priced helmets. You might get lucky like I did a score a good fit for $70. My advice, go bigger than you think. According to their head measuring I should have been happy with an xl, so I ordered a xxl, but it was still to tight, sent it back n/c and got a xxxl, and fit great.