Researchers found that round prices work better for emotional purchases (Wadhwa & Zhang)
Round prices are processed fluently, quickly and use less mental resources so they feel right.
$10 will convert better than $9.67 and even better than $10.00.
Consider this when pricing your product / service but only when emotions are involved.
Source of inspiration and recommended for further reading: http://www.nickkolenda.com/psychological-pricing-strategies