I just took a look at the Tetenal C-41 1 liter kit. The total price is $39.99+$6.00 shipping to a total of $46. It says it can process 12 35mm-36 films. So the average cost is $3.85.
But I can get my 35mm films processed at Costco for about $1.60 a roll. The quality is fine and the film will be ready in an envelop.
So I just do not know if it is cost effective to buy the small quantify chemicals.
I understand that there is value to develop your film by yourself. But if you count the possible mistake you could make and the waste of some chemicals, the cost would be even higher.....