When shopping for a bed, it is always better to look for the best value you can get for your money, rather than the lowest price tag. There are, of course, some lower priced beds which are perfectly acceptable. However, the better the construction and the higher the quality of materials used, the more support and comfort your bed will give you.
A better-quality bed will also last longer and will give greater performance in its later years of life. So our advice would always be maximise the budget available on the bed you are going to sleep in every night – it will pay you much greater dividends in terms of quality of sleep.