Unfortunately the only readily available 1/4 bodies are the Eenterbay bodies on ebay at the moment. I own a few of the T-1000's and the all black body, all are usable for the average character. The $129-$179 price tag is not for the faint of heart. But I guess we didn't get into this hobby to stay rich
Anything fun you're working on?
These are the most consistently available bodies.
This is the Coomodel 1/4 body
If you're not looking to break the bank, a solid alternative is finding a cheap Diamond Select Quarter Scale figure. They were made in the mid/late 2000s and they used cheap plastic so they're often sweating/sticky. Also to note, DS procured the molds from the Art Asylum Bruce Lee figure so all of the figures look emaciated. I believe the thinner bodies make for better bases as you can build up to the physique you need using foam/cloth.
Kirk is usually the cheapest to find, anywhere between $15-$50 is a good price. A lot of the star wars, Terminator, and Indy figs go for more.