Yes the T/C Hawkins comes in kit form. It comes in a .50 caliber and .54 caliber. Both of them have the 1-48 twist. You might have to do a little searching to find the cheapest price. I would start by looking at;
Bass Pro Shop ( www.basspro-shops.com )
Cabela' s ( www.cabelas.com/ )
Dixie Gun Works ( www.dixiegunworks.com )
RMC Sports ( www.rmcsports.com )
and there are many many more out there that have the rifle in kit form. Good luck in your search. I have also seen that some of the people on the board sell rifles, and they will offer a good price perhaps, or point the way to other retailers.