Composer needs access to piano

[Gill the Piano]

Look on eBay - I've seen them go for as little as a tenner there. Also, advertise in local shop windows - it's amazing how many people have pianos they don't want but haven't actually got round to getting rid of.
Tell the local music shop, as they might have ideas, and finally ask at the local church, because their piano/s probably lie idle most of the week.
Good luck!