While it's possible to promote your book on a shoestring budget, especially if you focus on online book marketing, you will still need a marketing budget.
The amount you should budget depends on your book marketing plan
. Here are some expense categories to consider and some money-saving tips:
Website design and hosting fees. If you build your website on a blogging platform like WordPress or TypePad, you'll minimize the costs for online book marketing. See this page for blogging resources for authors