Being able to visit three countries for almost the same price is a good deal!
Almost the same price=価格がほぼ同じ→そんなに変わらない値段
good deal=お得
That's a good deal that you can visit three countries for almost the price of one!
1か国行くのと同じような価格で3か国いけるなんてお得だね!
と表現する方法もあると思います。
It's a good deal if you can go to three countries for almost the same price as a direct flight to Australia.
この場合、次のような言い方ができますよ。
ーIt's a good deal if you can go to three countries for almost the same price as a direct flight to Australia.
「オーストラリアの直行便とほとんど同じ金額で3カ国に行けるなら、お得だね」
a good deal で「お買い得品」
almost the same price as ...「…とほとんど同じ金額」
direct flight「直行便」
ご参考まで!