Thank you both for your help!
Peter, your tips have been very useful. But, do you think e-bay is trustful? I've never bought anything there so I don´t know if its a good way to buy something? Do you have experience about buying in e-bay?

Hi whiskey, our idea is to travel in holland from 1st to 15th july so I hope the weather will be ok and it wo´nt rain too much. Which parts of Holland are the best ones to travel by bike and to visit, too? And do you know aproximately the prices of a camping site for one tent one night?

I hope finally we do this travel but we afford between 800-1000 € so that´s the problem we have...

Thank you again for your help,

Fernando