Susan - Why would you not get roses based on one disease? Just don't buy the roses that are very prone to it (like knock outs). We all have roses here & we all have that worry about RRD, but that doesn't stop us.
You just gotta keep trying!! I'm gonna honestly say that I've never had a single rose w/RRD, nor have I even seen one with it. Maybe I'm just lucky & it's not in my area (yet)?