An economical way to get this page created I'd suggest you would be to use something like www.elance.com or www.guru.com.

I hope you find this info helpful.

If you want to sell online and are already familiar with a CMS platform maybe prestashop is one solution: http://www.prestashop.com

The good thing about wordpress is that it is versatile, and will allow you to create sales pages within your blog so that you don't have to build separate pages or a separate website, and can keep everything looking somewhat uniform.

In any wordpress blog, you can make pages which generally are linked to in the top nav bar. While these pages will generally take on the form of the rest of your blog site, you can actually choose to have the pages show up in a different template so that none of the stuff in your blog sidebar will be a distraction. These pages also allow you to post HTML so that the page content can show up in any way you want it to - so, you would only have to have some HTML stuff done if you wanted to. Otherwise, you can easily format it via the easy text editor that wordpress provides.

Another option you may consider is buying a "premium theme" for your blog. The Thesis Theme is an extremely versatile one. It comes with a bit of a learning curve, but the support forums are full of advice from extremely helpful people. There are tutorials out right now for how to create sales pages (landing pages) with the Thesis Theme. You will be able to have your regular blog and other pages, but you will be able to also create custom sales pages directly from your wordpress backend, rather than pay someone else to do it.

I hope you found this answer helpful. Feel free to ask about anything I said if you need any clarifications or further explanation!

When you say "Economical" i understand that you don´t want it for free. In Argentina you can find cheap bids like due the money exchange :P (sorry for my english) You can check this site www.webneex.com

SquareSpace is probably the easiest way to get started. It's designed for non-programmers, and they have very nice templates you can work with.

http://squarespace.com

I guess it depends what you think your time is worth. IF you currently are making more money using your hours talking with clients and getting actual business done maybe its worth your while to go and speak with a developer about handling the web-development. A well designed website is far more than purchasing a well designed theme. Most well designed themes are not even built to web standard. The problem with a word press theme is that they end up becoming unsearchable(by google ect) and generally reflect a poor quality. If your web-page is your virtual office, chances are most of your customers are going to use your web-page as a reflection of the quality of your business. Its not worth it to chance your reputation, and the possibility of your success on a home-made web page with mediocre or half-way done. If your interested in learning more about how the web can work for you check out www.begincreative.com

Try Front-Page or Dream-Weaver

And dont forget the rich learning resources of the web.