There is nothing wrong trying to get a discount or looking out for tyres which are of good value. But what I do see are people being extremely stingy and not changing their tyres when they need to (after long extended periods) or even people driving with bald tyres. Worse of all, buying re-purposed tyres is something we should avoid purely because of safety sake.
So I do implore you to have a look at the video below and always buy the best tyres you can afford for your car. Always do a visual check and to always keep track of the tyre wear. Tyres are the only thing in contact with the road so please treasure them.