That's cheap, a 100 yen per litre! I haven't seen it this cheap for a long time.
What a deal, a 100 yen a litre is a bargain! I haven't seen gas for this price in quite some time.
ーThat's cheap, a 100 yen per litre! I haven't seen it this cheap for a long time.
「リッタ−１００円なんて安い！こんな安いのしばらく見ていないな。」
cheap「安い」
I haven't seen it this cheap for a long time. で「久しぶりにこの値段を見た」というニュアンスになります。
ーWhat a deal, a 100 yen a litre is a bargain! I haven't seen gas for this price in quite some time.
「安い、リッター100円なんてお買い得だよ！ガソリンがこの価格なのはずいぶん見ていないな。」
deal 「お買い得品・バーゲン品」
bargain 「安売り・格安品」
in quite some time 「ずいぶん・しばらく」
ご参考まで！
カナダ 
