In India? Rhythm House sells a small quantity. I've spoken to them about the problem of not being able to explicitly search for them. They are redeveloping their site soon. Abroad, CD Connection continues to be the best/cheapest (CDconnection.com the best CD/DVD store on the web!).
Some of the big-selling artists have had their back-catalogue released on SACD. The Stones, Dylan come to mind. SACD/ redbook dual layer has superseded redbook only for these artists.
There's a fair sprinkling of Jazz and Classical titles.
In their stocking decisions, retailers I don't think go by the format too much; instead tend to favour artists/ content that 'sells'.
Rhythm House etc. may be able to order titles for you on request. Still, best bet is to look abroad for the more esoteric titles.
OCeanic Sound and Vision carries good number of SACD. Just call Vikram @ Oceanic : 020 2634 2658, tell him about your music interest, he will provide you a list. They do mail orders.