The firms could try and work out an arrangement in which one firm pays the other to maintain high prices. For example, Firm 1 could always charge the High price and Firm 2 the Low and Firm 2 could pay Firm 1 11.5. Of course, these payments make it much easier for the firms to be caught violating anti-trust law.
A simpler approach is to take turns being the "High price" firm. Perhaps you've noticed that in some industries competing products are never "on sale" at the same time. For example, this sometimes seems to be the case in the soft drink industry. Perhaps this is the game they are playing.
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