Yes. You can add a chainring spacer to a 10 speed crankset to fit 9 speed chains. Also, if you like 9 speed, just keep riding it. Flush your shifters with solvent if they get sticky. Relube as necessary. Keep an eye on Craigslist for 9 speed bikes and salvage the parts off them. When the time comes, upgrade to 11 speed and be done with it.