又便宜又方便英语可以说是"both affordable and convenient"。这个表达的来源可能是来自于人们对于产品或服务的要求，即希望它既便宜又方便。例如：
This hotel is both affordable and convenient, so it's a great choice for travelers on a budget.
I love this new store because it's both affordable and convenient. It's right next to my house and they have really good prices.
翻译：
这家酒店既便宜又方便，因此对于预算有限的旅行者来说是个很好的选择。
我喜欢这家新商店，因为它既便宜又方便。它离我家很近，而且价格也很实惠。