〜を限りに

本日(ほんじつ)を限(かぎ)りに閉店(へいてん)いたします。

Honjitsu o kagiri ni heiten itashimasu.

We close for good today.

を限りに means that is the last of it, and an ending follows

今日(きょう)を限(かぎ)りに、たばこをやめます。

Kyō o kagiri ni, tabako o yamemasu.

As of today, I am giving up smoking.

Declaring a resolution with it lends formal weight

店(みせ)の張り紙(はりがみ)でよく見(み)ます。

Mise no harigami de yoku mimasu.

You see it on shop notices.

In speech 今日で最後 is enough