Just called the local music store and they want 50$ for this thing called a lightsnake. But its only a cord? Anybody else own one of these or know a way around it?

I heard you can buy like a little adapter plug and just use that, but when i searched for it I couldn't find anything.
I personaly use this : http://pro-audio.musiciansfriend.com/product/MAudio-JamLab-Personal-Guitar-System?sku=241104

The software for it is terrible thought, try something like Amplitube or Guitar Rig with it. I use Guitar Rig 3 and it works pretty well.
Gear :
Epiphone G400
Schecter Hellraiser C1 FR
Peavey Vypyr 30.

Please excuse my lack of proper spelling and grammar, english isn't my first language.