The price for a one way ticket is SEK 95 (DKK 77). If you have a discount card the price is SEK 76.
I'm afraid it seems like the discount cards can only be bought in Skånetrafiken's Customer service centers or on busses on the Swedish side.
The discount cards are not refundable.
(However. The discount if only SEK 19 ~ $3 per one way ticket).
Here you can read all about travelling with Skånetrafiken in Skåne and over the sound to Denmark:
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