Retainers, confirmed, you have to pay for them.

[Kaisha]

Or! since you only need 1 character. Cheap sub = $10, +$4 for retainers = $14 a month, still less than other p2p mmos.

Entry-level is $11.99, not 9.99. So you're paying $16 still, which is higher than most MMOs that offer more inventory storage options.