I'm not surprised they've taken the nursing bras off the website - I don't think they put enough thought into the needs of nursing mothers when designing them. They did this thing badly and it turned out unprofitable.
VS nursing bras came in the same range of sizes as their regular bras, but, as so many of us have reason to know, nursing breasts do not necessarily come in the same sizes as non-nursing breasts.
Fit is VITAL to nursing bras, both because nursing breasts are incredibly sensitive and poor support is very painful very quickly and because bad fit can cause plugged ducts and infection. VS (the entire chain) is *terrible* at fitting. They will always try to sell you a size they have, even if it's the wrong size for you. This made a lot of nursing mamas (myself included) suspicious of the product. "Sister sizes" are just not okay when a badly placed underwire (and yes, one of their nursing bras had underwires) can make you physically ill.
Finally, VS has some serious competition in this area. There are more and more lingerie websites springing up, with lower shipping costs and better return policies than VS offers. (figleaves.com!) Why should I pay $14 shipping to buy a bra from VS, and then potentially go through all kinds of trouble to return it, when better, cheaper service is available?