We do not discuss specific breeders here. But the best advice you can get is to call your local boxer club and find out from them what breeders they would recommend.
There are so many bad unscroupulous breeders out there, doing your research on finding a reputible one will pay off so much in the long run. Please do not just pick a boxer pup cause that breeder has one available. This type of thinking is what perpetuates the bad breeding business.
Save yourself possible heartache, sick puppy, or financial burden and select a reputible breeder - which most likely, you will have to wait for the next litter or two to get your puppy.