Packs are currently sold out - new Chaos Legion packs are set to come out in September.

You technically can acquire packs on hive-engine - but that’s a bit more advanced - and you’re buying them direct from other people rather than from splinterlands (which isn’t a problem, it’s safe, they’re just more expensive than when you’re able to buy them direct from Splinterlands)

Placing a bid on peakmonsters (if that’s what you’re talking about) is like saying “I’d buy this card for this price if it became available” - when you do that, peakmonsters is able to automatically buy cards for you if they show up available at or below that price on the market.

Since that is done as a sort of auction, whoever has the highest bid gets the card, though they won’t necessarily pay their bid price - it could be lower.