A woman will be charged on summons after selling weapons at a garage sale in Warrnambool, in south-west Victoria.

Police say the 42-year-old woman was selling knives, a samurai sword, throwing stars and a sling-shot at the sale on Saturday.

Acting Senior Sergeant Tanya Barbary says the weapons were seized after a tip-off from the public.

"It's perhaps a little bit frightening for us, as police, that those weapons are being sold to the public with no control or restriction and anybody could have their hands on them," she said.

"We don't want them out there."

Acting Senior Sergeant Barbary says the woman could have handed them in without penalty under a state-wide weapons amnesty.

"But because they were actually selling them to the public, there's a whole raft of offences that person will face before the court."