Hi Marcia,
Welcome, I am sure your Blu was a very nice dog. You mentioned looking for another one, a female.
Blu is what we call a Merle color, not allowed in cockers. You see Merles more in herding breeds. Merles in cockers carry a host of health problems, such as blindness, deafness,to name a few. by looking for a breeder , you are condoning the breeding of Merles. There are several back yard breeders that will "breed" Merles. That also tells me that they are not doing their homework. Cockers do have inherited health problems like cataracts, some are carriers of PRA where the retinas will atrophy and they can go blind. There is hip displasia, IMHA ( also can be caused by vaccines). As well as other problems. Usually breeders will health test their dogs. Just make sure you ask your questions and are informed. If you were talking about rescue. That is great, there are many sweet babies out there that need a home. I see that you have rescued before, wonderful. Also rescues are spayed and neutered. Please do not buy an intact female Merle and intend to breed her.