$70.00 for a neck sizing collet die and special seating die. They also sell different sized mandrells for $10.00. 
Just talked to them.
Gotta have one of them.

I use a RCBS Competition Seater Die. The price on the Lee Collet set is $70.00 with or without the seater die  Not a difficult choice. 
I was expecting the $160.00 amount. The break on the Small Series and the Large Series: " Cartridges with a bullet diameter larger than .375" or base diameter .555" than those listed above can be made in our Large Series Dies, which have 1 1/4x12 thread. Please see listing below for cartridges we can not make. Note that these Large Series Dies will only fit into our Classic Cast press, and some competitors larger presses. The cost for our Large Series Dies is $160.00 per set plus shipping and handling. Large series dies can be made for cartridges ranging in size up to and including the 50 BMG."


As soon as I asked about the 38-55 he said $70.00.

Ireload 2, the collet die is not the same as the "reloading dies". Besides, I use RCBS dies with a competition RCBS seater.
 
The collet die resizes a small portion of the neck by fingers colleted around a precise mandrell. They told me that I would get .002 neck tension or a little over. I would think a mandrel could be made to order locally. One can read a lot about the Lee Collet die rendering a case with, usually, less than .002 runout.

The 38-55 case is difficult to size for neck tension and I believe the Lee will out perform the neck expanding mandrels because it will resize the same amount of length every time rather than guessing or adjusting your FL die to work.

I believe the OP is under the impression they do not make the collet die for the 38-55. They don't list the 38-55 but they will make one for you.Well, they checked on the ability to do so and took my money. 
Looking forward to trying it out.