expression, godan verb (-ku)
be cheap; be inexpensive
Used when something turns out to be cheap or costs less than expected. Often implies a favorable outcome.
この方法なら安くつくよ。
This method will be cheaper.
まとめて買ったほうが安くつく。
It's cheaper to buy in bulk.
Standard kanji-kana spelling for this expression.
Alternate kanji spelling using 付く; less common but valid.
安い is a simple adjective meaning 'cheap', while 安くつく is a verb phrase meaning 'to end up being cheap' or 'to cost less than expected'.
Combination of the adverbial form of 安い (cheap) and the verb つく (to take, to cost).