Any particular reason that you NEED to use a port connection parallel? The technology is pretty much dead, so you usually have to pay out the nose for parallel accessories. Unless you have a really nice old model laser print you want to keep around, the inkjet printer prices have dropped so low (you basically get a printer for free after you pay for the cartridges on the low end models) that you could probably pick up a cheap inkjet and a USB Bluetooth printer adapter for less than what a parallel adapter would cost you.
EDIT: At least you can in the US. Just noticed you're from Spain, so I have no idea what the printer market is like over there.