Walmart is selling a $300 cordless lawn mower for only $140, and shoppers call it 'the best buy ever'

TheStreet aims to feature only the best products and services. If you buy something via one of our links, we may earn a commission. The smell of fresh-cut grass is in the air, the weather is warm and lovely, and you're still holding onto that old hand-me-down gas mower. But it doesn't have to be…