The 3 prominent factors to consider are house size, material used  (ex. copper vs. aluminum) and sectional vs. seamless kinds.
Prices can range anywhere between $5 and up to $30 per foot.  It varies as a function of materials used for the gutters.  For example, sturdy, high-quality copper gutters will meet the high end of the price range compared to vinyl, galvanized and aluminum gutters.
Additionally seamless gutters are more expensive than sectional gutters due to the fact that they require less maintenance and don’t leak nearly as much as sectional types.