HELP- How To Do This Particular Sh. Chart on WP??

Hi guys, i need to install in wordpress some kind of ecommerce, or shoping chart, but what i need exactly to do is this:

The products are books, and when a client needs to buy a particular book, then they will click on a botton ,ad they will be rediredted to another page (underwordpress using some plugin? or maybe outside?) there they will select which book they want, and then which country are they from and after that automatically it will show the price he-she has to pay.
And thats because the price vary depends on the residence of the buyer (shiping)

So, in a nutshell: select the book to buy (form a menu), select the country (from a menu) and then the price will automatically be there and a PayPal bottom that corresponds with that price, customer click on the PP botton, they pay on PP and then they came back to the site.

Can anybody help me on this?

I've not seen a plugin that does exactly the way you may want it, but there is work arounds, if not you'll have to either recode existing plugin or get one made.

Here's some plugins based a quick search, http://wordpress.org/extend/plugins/search.php?q=shop.

@leephp: yes ive seen all those plugins but still cant find one that does that.
Its weird cause its pretty basic what im asking, i think, a commons need, must be a solution, but i cant find it