I realize the title is probably too broad to answer, so I'll narrow it down a bit:
Quality: Pattern welded iron/steel, crucible (or pseudo-crucible) steel (e.g., high end VLFBERHT swords), or piled/laminated iron/steel; properly forged and quenched (i.e., takes an edge properly, isn't too soft or too brittle). Ornamentation and embellishment not necessary. In short, a well made weapon that a knight would be proud to carry into combat, but not a gold-hilted, jewel-encrusted sword a king would carry during ceremonial duties.
Time Period: 600 C.E. - 1400 C.E.
Monetary value: Any currency is acceptable, but for convenience, provide an estimate of the 2016 equivalent value.
What would a European warrior pay for a sword like this, and how much would that price equate to today?