wbshop.com has DANCING LADY in stock (nobody else seems to due its OOP status). Price shows for me as $8.66 but I'm a WB Insider Rewards Member (free to join). DVD includes PLANE NUTS (1933) and ROAST BEEF & MOVIES (1934) as extras.
FLYING DOWN TO RIO, also OOP, is also in stock. Extras include BEER AND PRETZELS. $8.66.
ANOTHER THIN MAN, also OOP, is also in stock. This 1939 film includes a Shemp cameo. $6.46.