Case Statement - Count Orders That Fall Into Specific Dollar Buckets

I have a table of orders. I was asked to count the orders that fall into specific dollar buckets. Normally I would use a CASE statement for this, but in this case, there are over 100 different buckets!

For example, I need to count the orders in $5 increments up to $400. The CASE statement would look like this:

Code:
CASE
WHEN sum(revenue) BETWEEN 0.01 AND 5.00 THEN [0.01 to 5.00]
WHEN sum(revenue) BETWEEN 5.01 AND 10.00 THEN [5.01 to 10.00]
...
WHEN sum(revenue) BETWEEN 395.01 AND 400.00 THEN [395.01 to 400.00]

Is there an easier way to do this, maybe with a loop?