I haven't checked the datasheets yet, but at diyaudio, they have some limited stock of LSK170 for sale in batches of 8. pricey, but maybe some of us here are interested.
here is a link.
http://www.diyaudio.com/store/parts/lsk170-to-92-jfet.html (http://www.diyaudio.com/store/parts/lsk170-to-92-jfet.html)
hope i'm not violating MBP policy.....
From what I remember when I looked them up when I saw them in the past, the LSK170 is a replacement for the 2SK170 which is a low noise JFET intended for initial input stages in audio equipment. The BS170 is a generic MOSFET.
Ah, I saw the 170 and figured it was maybe a higher end version of the MOSFET
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