Selecting a bit that fits and is accepted by the horse can take some time. Herm Sprenger has some great snaffle bits that were really high on my list; the Herm Sprenger Dynamic RS Loose Ring Snaffle Bit or the new Herm Sprenger Dynamic RS Sensogan® Loose Ring (which has all the benefits of Aurigan, but can retain a new looking color longer.). Both will set you back some $140 or so.
Dressage On A Dime’s pick for most similar bit was the AlBaCon Elite Loose Ring Snaffle Bit. Love it, it is priced just slightly above a regular snaffle when on sale, and La Prima seems to like it too. Ordered it from Dover Saddlery (and as usual there is no kickbacks from them to me for writing these sort of posts.) along with a great cooler, and they included a Bit Butter that can help soften the mouth, help with bit acceptance, and help with rubs on the lips.
My other mouth “thingy” right now is a set of Rein Aids. They add some extra elasticity in the hand connection, and I figured they would be great to start out with. Mine were found for a steal at Wild Horse Consignment in Shingle Springs. They have a lot of used stuff and it’s a place worth stopping by.