I have seen several websites that have rugs on sale right now. Just Google area rugs and you will see the websites that have rugs on sale!

You have a lovely room. I'd opt for a rectangular rug to balance all the round features you already have. I assume the candles match the curtains/flowers in the chair fabric? I'd be sure to incorporate that color in your rug. Something like this would be lovely.

A square rug would work. Make sure big enough that all chairs sit on rug when pulled out.

Do you have room between the table and china for a rug 4' larger than the table? That's the minimum allowance for chair scoot and sit space. Don't want the chairs falling off the rug when in use.