There are many different varieties of blood red dragons, some of which are expensive. Here are some of the most expensive blood-red dragon breeds:

1. Gold Dragon: This is one of the most expensive blood-red dragon breeds because their color is very rare and hybrid. Their prices can run into hundreds of thousands of dollars.

2. Red Dragon: This is one of the most popular blood-red dragon breeds because they are beautiful in color and relatively easy to obtain. Prices depend on size, age, and color and are usually in the thousands of dollars and up.

3. Blue-eyed dragon: This is a very rare blood-red dragon species with blue eyes and a unique color. Their prices can run into the tens of thousands of dollars.

4. Gilded Dragon: This is a very rare blood-red dragon species with golden dragon scales. Their prices can run into the tens of thousands of dollars.

Please note that these prices only refer to the highest possible price. The actual price usually depends on the merchant, market, origin, quality and other factors.