Immediate applications for a rtsc would be MRI machines. Those cost between 300k and 500k. They require helium for operation.
A superconductor at room temparature could remove the need for helium or even nitrogen. It could possibly make the machine work with a thermal electric cooler which would drastically lower the upfront cost and the maintenance cost of an MRI. Also, the machine would become smaller which would eliminate the need to roll patients into the machine itself, further reducing costs.
Where a big hospital could only afford one MRI, many small hospitals can now potentially get one for 80k.
I dont know any other existing commercial applications of superconductors.