I know the financial cost for my stocking of CNBG and RES, my supplemental stockings of trout and shiners, and my stocking of LMB.
The CNBG and RES were dirt cheap (from my perspective on price). Without looking up what I paid I _think_ I paid around $400. I have not stocked anymore RES or CNBG since my initial stocking. I have identified 8 spawns of CNBG since my initial stocking in May of 2014. I stocked adult size, medium size, and babies. I see lots of these 3 sizes when I walk the banks, and of course when I toss in food (be it pellets or live food).
The supplemental offerings of shiners has been quite limited in both quantity and frequency. Most often associated with my wanting to shoot some video of the bass going after the shiners. I have one video where a LMB has a CNBG and a shiner dropped in front of it, and the LMB bee lines for the shiner. Another video was a shiner and a trout and the LMB lunges for the trout. With my LMB in my pond the trout are the preferred forage hands down.
The supplemental offerings of trout also has been limited in both quantity and frequency. Due to cost and availability. But I also stock medium size trout, larger than the shiners I drop in.
A friend has begun breeding tilapia and raising them to various sizes before stocking them in his pond. This seems to be a great return on his investment in feeding his bass.