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Thanks to travelisfree on this Flyertalk thread for sharing a promo from Freecreditscore.com that will award 3,000 Southwest Rapid Reward points (worth $50 in Wanna Get Away Fares) after you have two paid months with Freecreditscore.com. So, for $14.95 per month for two months = 29.90, you get two months of this credit score service and the equivalent of $50 in Southwest points.
The Flyertalk thread referenced above mentions that these points may count toward a Companion Pass. While that is possible, these points could very well be interpreted as a bonus, and thus would not be eligible. As long as you are good about canceling things on certain dates, this could be a way to pick up some points at a “profit” and get some credit score monitoring in the meantime (though there are cheaper places for that if that is the service you are really after in the long run).