I haven't seen pumpkin seeds, although I've roasted my own. Not a success. And I didn't see pumpkin for a long time, but just last week I bought a pumpkin at the Bern farmer's market - I think it was pretty much the end of the season, but it was one of those greenish skinned pumpkins that's really sweet inside... kombucha or something. You can also substitute butternut squash, I imagine, if that's available.