Here are few that I have not seen mentioned yet that have helped me.
Infinit is a good option if you don’t like to stop often or eat much (I know some IRONMAN veterans that just us GoFar). Bonus, is you can order custom blends to add extra anti cramp ingredients (e.g. sodium). Additionally, the recently released Tripwire, that comes in Dill Pickle flavor, that apparently is more cramp specific (I’m yet to try). https://www.infinitnutrition.us/
Base Performance Electrolyte Salt, unlike others on the market this is not in pill format. Instead it is loose salt you just lick you thumb shake the container on the wet spot and lick the salt for faster absorbstion. https://www.baseperformance.com/collections/supplements