Can be free, or even just cheap, anything less than 20 dollars but no subscription.
I wouldent want to play them for the long term but ive had fun, with friends, in free-to-play MMO's like Shin Megami Tensei: IMAGINE Online (though I hear Runes of Magic is the best F2P MMO).
You can also play Dynasty Warriors Online for free in parties of 4.
If you want to go a more action-RPG route then you can play Phantasy Star Online (Blue Burst) for free on your PC (and technically on consoles with some work) here which is still a pretty fun game.
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