One of the things I'd realized about -1/-1 counters is that they allow us to make effects where the creature can grow, but unlike +1/+1 counters, we can cap the effect
That said, sites like TCGPlayer still have a solid supply, and in some cases, better prices too
PT (UTC-08:00) on the ending date shown unless otherwise noted
These include cards like Blood Tyrant (drain, +1/+1 counters), Dragonmaster Outcast (5/5 dragon tokens), Indulgent Tormentor (draw, drain), Sin Prodder (draw, drain), Thassa (scry), Twilight Prophet (draw, drain), Wildfire Devils (reanimate spells), Skyline Despot (5/5 Dragon tokens), Avarice Amulet (draw), Extravagant Replication (clone), and many many more
Yes, you can pay 3 mana to stick a counter back onto Iceberg before you untap, and sure, you can do cute things to reduce costs or repopulate your ice counters with Rimefeather Owl, Zirda, the Dawnwaker, and proliferate triggers