All the major manufacturers make them. Probably have to order it from the plumbing supplier; not a stock item. You can also purchase liner kits to retrofit into any toilet.
Since you are in the new construction phase, it would also be very easy to install a tempering valve for the water supply to the toilets.
Condensation is much less a problem today, than in the past. Since your toilet will likely flush only 1.28 gallons per, there is just that small amount of 'new' cold water mixing with 3 to 5+ gallons already in the tank at room temp.