Interesting fact, is, unlike real shopping in malls and stores, a customer cannot be forced or pushed into buying a product or a service. Hence, your design and user interface and explanation about about the product or service should be clear and impressive enough to lure him into buying it. The idea should get clicked in the minds of your target audience, which cannot be done without quality web design of your website and good quality content.
Now comes the presentation part. Even if you have everything set up well, but in an unorganized and messed up way, chances are that your potential customers will give your products a miss. The reason for this being, customers, who are shopping online, are looking for a similar customer experience as that in a store or mall, which can only be done by presenting your products and services in a professional way, and not just by writing a few lines on the products and expecting the users to buy it. Hence, a quality and cheap web design provider must not only design the website well, but also arrange the given data and product or services categories in an organized way, facilitating customer friendly experience.
Hence, one should consider these points properly, and then go for a quality cheap web design provider, as simply trying to pick the cheapest one will not reap any benefits, neither in the short term nor in the long term, and will simply be a waste of time and money.