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