Multi Conditional Case Statement

I need to come up with a case statement and I'm not sure if I should do it as part of the table join or in my select statement.

Bur when a Status is Price Reduced then I need to pull a price that was effective the day after an issue was closed.

If the Status was not equal to "Price Reduced" I need to take the first price change in the next 30 days and use that value.

If there was no difference, then I need to use "Null"

Any help you can provide would be great - Here is what I have so far and I tried it in the select statement but I get errors when I try to get the statement to evaluate the date range between.

CASE WHEN a.STATUS = 'Price reduced' 
       THEN DATEADD(d, 1,a.CLOSE_DATE) IS  BETWEEN p.PRC_EFF_DT AND p.PRC_END_DT
       CASE WHEN a.Status != 'Price reduced' 
       THEN DATEADD(d, 30, a.CLOSE_DATE) IS  BETWEEN  p.PRC_EFF_DT AND p.PRC_END_DT
    ELSE NULL END AS p.PRICE,