Your not going to find 1" ply at Rona let alone them bucking it up 1" for you - not too widely used and pricey. half or 3/4" yes but not 1". I would be very surprised if so. PM me tomorrow and we will figure something out..... As long as its for something fishing related.
Ps it will be used from hoarding, shoring or formwork but in decent shape for free.