This question is akin to asking how long a piece of string is. In truth some people will want to spend the minimum on shoe racks in order that they can store them away just as they want them to be. Provided they are out of sight and safely stored without being damaged, this is all that matters.
Alternatively it is possible to spend a three figure sum (sometimes more) on shoe racks that are designed as complete freestanding units. These can be made from wood and have a selection of drawers in them as well as other essential storage places.
The key thing to remember is to have a firm idea in mind as to how much you would like to spend on your shoe racks before you go shopping for them. You will find every type of shoe rack you could possibly want online, and the sooner you know what your budgetary limits are the easier the buying process will be. Remember that some online outlets will have a postage and packing charge to ensure your goods reach you safely, so ensure you account for this as well.
A big part of knowing you have spent the right amount is simply knowing whether the quality of the shoe rack warrants the amount you will spend on it. For example you may feel that paying £100 is perfectly fine for a shoe rack or a series of them. But you want to know that the quality will be very good for that price. You would expect it to be far better than if you were to pay £5 for a shoe rack, for example. So make sure you compare and contrast the prices as well as the items themselves.
Buying new shoe racks should always be done with an eye on the room they will be going in. Obviously different rooms will have different requirements, so you can focus on what you need and how much space you want to allocate to the racks. The more information you start with, the easier you will find it to get