Waders (Brookline NH)

I've been teaching my son to fish and we got him a pair of waders i was wondering if anyone had an old pair that they have replaced and are just laying around or even some long boots im a size 11 but would be willing to take a 12 possibly 13 if thats all thats available it will be much easier being in the river with my son to teach him instead of yelling from the bank. I would just buy some but we have hit some difficult times and just had to put a ton of money into our vehicle. Thank you for your time. I will respond asap