How much should it cost to replace all three transmission mounts minus mounts.

labor time is 7 hours when adding each mount by itself, I'm sure there is some over lapping time on some of the mounts if all are done at the same time.

You want to replace them with OEM parts not aftermarket. The reason being is because aftermarket although cheaper may result in the vehicle shaking worse and the parts are not as good quality. There's numerous reports of people buying aftermarket and having issues or early failures. I was told there is 1 engine mount and 3 transmission mounts. I was given a quote of $1,500 in Arizona this is a total out the door price. You have to compare shops in your area.