Despite your son and 100's (100's?) giving up their season ticket City haven't made available a single season ticket for 5 years, I doubt cracking down on abusers will change that-City clearly want to reduce season ticket numbers.
We sit in 202 (padded seats), couple of people next to us gave up their season tickets a few years ago. They rarely sell but when they do people turn up with a barcoded ticket on a piece of paper, clearly City have put them on sale with one of their 5 official resale partners!