bob's
http://www.gun-parts.com/marlin/his site layout is kind of, well, crappy, but he lists the 336 on the left side. It starts with stocks, but as it goes down, he's listing the works.
whether its in stock, don't know
Here, I filched the text:
1 Marlin 336 Stock Checkered.....$100
#2 336 Stock Straight Checkered....$100
336 Straight Grip Oil finish Plain..$85
Forend 336 Checkered.....................$60
Forend 1898 Forend Checkered......$80
#3 336 Pistol Grip Stock Plain.........$85
Forend Plain for 336 Lever Act...$50
Stock Walnut Semi Finish.. P grip..$75
Stock Walnut Semi Straight Grip...$75
Just Butt Plate.. Requires fitting...$25
Tang Stock Screw............................$ 6
Carrier Assembly .................Net....$45
Carrier Screw Each..........................$ 3
Ejector With Spring..........................$20
Extractor With Spring......................$15
Lever.................Net.........................$50
Lever Spring.....................................$ 6
Left new model firing Pin.................$25
Right Old Model Firing Pin ..Net...$35
Rear Firing Pin.................................$10
Rear Firing Pin Leaf Spring............$ 4
Front Band........................................$20
Front Band Screw............................. out
Front Sight Ramp only.....................$15
Front Ramp Screw.....Each..............$ 2
Front sight that fiits on ramp...........$15
Rear Sight Snap Down....................$18
Thick Rear Sight Step......................$ 4
Front Sight Hood.. Oval...................$15
Front Sight Hood Round Top..........$15
Hammer............................................$30
Hammer Screw.................................$ 4
Hammer Spring................................$ 8
Hammer Spring Guide.....................$ 8
Hammer Spur Extension................Out
Loading Gate...................................$20
Gate Screw.......................................$ 2
Magazine Tube .........Net................$30
Magazine Tube Follower.................$ 8
Magazine Tube Spring....................$15
Magazine Tube Plug........................$18
Plug Screw........................................$ 3
Rear Band........Net.........................$20
Rear Band Screw.............................out
Tang Screw.......................................$ 6
