I do not sell stocks based on price action EVER. I can't emphasize that enough. Unless there were some material development that changed my opinion on the value of the shares.
I would not suggest selling at these prices. This is cheap by historic metrics, has lots of cash on the books (which has historically found it's way to shareholders pockets) and currently appears to have some positive momentum.
BKE occasionally sees negative comps, but usually it's when the prior year was a strong one. I wouldn't blame a hard-headed BKE bull for holding out for $50 per-share, although I may be cutting back before then.