First of all don't ever buy stuff labeled 'for RV's'. It will cost 10 times more than if you buy from a regular store.
I've had very good luck with cushions, pillows, bed spreads sheets etc. for the RV by simply looking for a local seamstress in your town. Some advertise on Craigs list or a local facebook group. Do a search on facebook for one near you.
Cushions are so simple to make and a local seamstress can make them for you for a WHOLE lot less than a stupid RV store. And make them in the material 'you' want.
You can also check with the dry cleaners near you they might be able to connect you with local seamstress.
We must be willing to get rid of the life we've planned,
so as to have the life that is waiting for us.