Nope, it is ongoing, winners each month.
That's correct. People can continue to enter for subsequent months' drawings. The only rules are the player has to be a member of the club and can only win once. And I think the giveaway is pretty decent.
The prize is a sleeve of player's choice (up to 1,500 credits). If the player chooses a ball costing 750 credits or fewer, then they receive as many sleeves up to 1,500 credits. For example, if player chooses a ball costing 500 credits, then they're gifted 3 sleeves.