|I fall into the third category|
First and foremost, be aware that some locations accept a quick-service Disney Dining Plan credit for turkey legs, while others do not. I'll detail not only which locations are which, but what the differences between locations are so you can get the best bang for your buck (or credit).
Frontierland Turkey Leg Cart (Magic Kingdom - Frontierland) - no sides
Liberty Square Market (Magic Kingdom - Liberty Square) - no sides*
Prince Eric's Village Market (Magic Kingdom - Fantasyland) - no sides
Toluca's Legs Turkey Co. (Hollywood Studios) - Served with chips or baked beans and corn
Disney Dining Plan Quick-Service Credit
Flametree BBQ (Animal Kingdom) - Served with baked beans and cornbread
Fife and Drum Tavern (Epcot - American Adventure) - no sides listed
House of Blues Smokehouse (Disney Springs -West Side) - no sides listed
Please note: Disney changes things often. If you find something different than what's on this list, let me know so I can update!