If you want a better price than what youd get at a card shop, try listing your cards locally online
Most early-curve filler characters are Common
The effect is optional as well, so if you don't have any combos to create with Cloudstone Curio's effect you can opt to not use it
you take no battle damage from battles involving your declared Normal Monsters or your "Primite" monsters (for the rest of this turn), then if you control no monsters, you can Special Summon 1 declared Normal Monster from your Deck or GY
For the rest of our army, cheaper bodies are generally better but its also potentially worth overpaying for a creature with combat keywords or other impactful utility
In particular, ZS - Ascended Sage is a great opener for this deck, as it can be Special Summoned if the player has nothing in play