Free update back to Lion?

Hi there!
I brought back my iMac, with Lion as OS, to how I bought it in 2009. OS thus, is Leopard. I've got Snow Leopard on disk. So upgrading from Leopard to Snow Leopard can not be difficult. But from there to Lion was done via a download from the AppStore. Do I have to make a purchase again? Or is there a way to 'get it back' for free? I have paid once for Lion. It's gone now. Or not? Can somebody out there help me?
Greetings from the Netherlands!

If you paid for Lion, go to the App store and re-download it.
It will be listed in your Purchases.

If you did not create a backup of the Lion installer, you'll have to install Snow Leopard and get it upgraded to 10.6.6 minimum to gain access to the App store.
I'd just install SL and then grab the 10.6.8 combo update.

This time, after you download Lion and before you install it, get yourself an 8 GB flash drive and create an installable image of Lion for backup.
The easy way.