Did you try the coupon codes? There are a bunch of them. Search Reddit for Nationals coupon codes. The ones for the Jr Nats and National Missing and Exploited Kids are the ones I use the most.
$11 plus fees for 222 is a great deal.
Stubhub. Didn't even look at the Nats site. I'll have to give it a look. Can't find any active Stubhub coupons.