I've been interested in leos as well, sunglows and tangerines in particular. What I've found is that it will depend on quality. The nicer the leo, the higher the price. I've seen them for less than $100 and for over $1000. Since tangerines are a line bred trait, the nicest ones fetch a higher price. So you should be able to find what you are looking for in whatever your price range is.
We have some SHTCT het tremper that are $30 each up to $90 each. We have sunglows that start at $50 and go to $150. All depends on the line and how nice it is.