You probably already took your trip, but for the benefit of others who may come along here are some addtions:
For drinkers: Some variety of punsch, of which the Carlhamn's Flaggpunsch is probably the most common and recognizable variety. Can't miss its yellow color. A far more intriguing gift than Swedish vodka, which is easily found everywhere. Legendary among cocktail buffs because it's an ingredient in many classic cocktails. You can get quite small bottles of the stuff at Systembolaget that would squeeze in at the top of your budget range.
For sweet lovers: A punschrulle, a pastry made with the aforementioned punsch, plus chocolate and marzipan and other good stuff. Also known within Sweden as dammsugare.
For foodies: A little jar of preserved herring. Or a little jar of lingonberry jam.
For book-lovers: One of Astrid Lindgren's beloved children's books (e.g. Pippi Longstocking) in the original Swedish.
Also, for the aforementioned dala horses there are little gift shops (especially in Stockholm's Gamla Stan) that carry little keychain dala horses. Obviously not of the same high quality as the genuine hand-painted ones, but still a charming and colorful gift.