Hi.
Do you know, if SL (Stockholm Transport) accepts ISIC card?
Reply to this I had a look at the SL-website. From what I gather students with an ISIC type card can buy a subsidised travelcard, however it is valid for the entire autumn term, so obviously would not be of much use for a shorter stay. I also don't know if you need to be actively signed up with a uni here in Sweden or not, but I would suspect that to be the case.
Here is the price list, look for the Students travelcard:
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