You're taking the right first step by marketing it on your own. The problem with selling on sites like amazon etc is they are all impulse buys based on a cover of a book and a short 1 paragraph description of it. It's extremely hard to sell a book at a premium without any trust or relationship with the buyer at all.
What I recommend doing is finding some niche sites related to "traveling on a low budget", then create some incentive based web banners ... For example: "how to travel the world with $20 a day" Free download. Then when they hit your landing page have a short video that tells about your travel experience, how you were able to do it cheap, and how much valuable information you will give them for free if they just sign up to your mailing list, and then a call to action to opt-in to your email list. After they confirm the optin (use a company like aweber.com for this) you can automatically send them to a link to download the "free tips" pdf which ultimately is a way of gaining there trust by GIVING AWAY YOUR BEST INFO for free.
At the end of the PDF have a call to action to purchase your comprehensive ebook/video course which reveals secrets to "x" "y" "z" that cant be found anywhere else. "This information will save you thousands of dollars in travel expenses yadi yadi yadi" ... at this point they should already be overwhelmed with the value they received from the free PDF giveaway and biting at the bit to purchase your high dollar comprehensive product.
What I just explained is a basic concept in internet marketing called a sales funnel. Email marketing, giving away free info, creating a dialog with your audience, and ultimately gaining there trust is the only way to bypass selling your ebook for less than you believe its worth. You may also want to consider building a membership site instead of a 1 off ebook that drip feeds the content in a series of ebooks over a few months. That way you are getting recurring income every month for top secret cheap traveling tips etc ...
