With Repeat on Meditation, must the additional cost be paid on the second iteration?

No. Repeat only repeats the spell's instructions, not its additional costs. On the repeated Meditation, the linked if you do, draw 2 instruction has nothing to link to, so you draw 1 on that iteration. If you do not pay the cost, you draw 1 then 1; if you do pay it, you draw 2 then 1.