Perhaps the cheapest developer one can make. All it takes is Sodium Carbonate (5g), Vitamin C (2g) and Metol (0.2g)… dissolved in that order, in 250ml of warm water. You then add enough water to make a 1L solution. That takes care of two 120 rolls.
How much does it cost? Around Rs. 5 in all for the entire solution, excluding water.
All thanks to this link: http://unblinkingeye.com/Articles/VitC/vitc.html
This photograph was shot on a Kodak Gold 100 colour film. Pentax K1000 + Rikenon 50mm f2
The solution ended up staying in the fridge for too long and appeared to be far colder than the thermometer said. So developed for 11 minutes. Normal agitation.
Big problem with anything to do with Vitamin C thus far is tablets need to be crushed. Which inevitably tend not to completely dissolve. If one can get hold of the powdered form of ascorbic acid, it will be better.
Digital Truth calls this mix the Gevaert 212. It seemed the easiest to make from the chemicals at hand.
More or less the measurements as given below:
Film was Kodak Gold 100 (colour) 35mm.
Developed for 4 minutes. Agitate the entire first minute. Agitate thrice at regular intervals for 5 seconds, later.