Update: For the Black color, Small and X-Large ships in 1-2 months and Medium is in stock on September 28, 2016.
No longer available:
Amazon has Champion Men's Closed Bottom Light Weight Jersey Sweatpant (Navy) on sale for $6.99. Shipping is free w/ Prime or on orders 49+. Thanks joe221
Update: For the Navy color, Small, Medium and XX-Large ships in 1-2 months. Large may require an extra 1-2 days to process. X-Large is in stock on September 28, 2016.
Editor's Notes & Price Research
Looks like any size as long as it's navy blue.
Now the Navy price is $10 with varying states of stock but back order available. Not as good but decent.