I know very quickly some people would say that

If people only shoot 10 to 20 films a year, it is not cost effective at all. You may need to buy 2 or 3 of the 1-liter kits since the shelf life of working chemicals are 2-3 months the most. That is $150 to process 20 films. Then you need to add color processing equipment.

I'd say try to find one or two good labs that you can "trust". Sometime I drop a regular 35mm film from a trip at Costco and they always do a very good job. C-41 is very standard now.

The other thing is to have some photographer friends and get some free chemicals from them