I don't know anything about refillable nespresso pods, but am pretty sure both Illie and Lavazza make original line pods.
Yes, search Amazon for Lavazza Nespresso capsules. Typically costs about $0.50 a pod. Depending on where you are I know Sur le Table sells Illy, probably on Amazon too, think they are closer to a dollar per.
This is only for the original line. If you have the vertuo line I think it is only through Nespresso.