I found a couple of sites, among all the mastectomy bra supply sites. I searched under post mastectomy recovery sports bras on google. I left it off after the first couple of pages....
Well, the links might freak you out. I figure you are pro-knowing, so you can deal with matters, but this may be too early for all this info, since you may have a benign situation.
Other folks here may have some good all-around bc support sites. I have one friend you may know, an abuzzer, who was extremely happy with the support and continuously useful information she got from one particular site, which I don't have a record of. Well, I do, but of course it's on my old computer, not yet transferred. I'll email her and get the link.
You might not want to see these until after a brisk walk, or somesuch, since I'm sure these sort of links bring the whole thing back, emotionally.
http://www.lehuanet.com/fighters/mmastect.htm
http://community.breastcancer.org/ubbthreads/showflat.php?Cat=0&Number=360691&Main=359956
[love, osso]