Online record stores rule, try any of these out.
If you have a credit card or can send in a check or money order, you can order InSoc records from these sites.

First of all, you can mail-order the new album straight from Cleopatra records.
Follow This link to CD-NOW, a great online record store.
MacroMusic not only sells records, but also hosts online chat events with artists. InSoc did one on 01/21/98.
AB-CD specializes in hard-to-find stuff. On the down side, their minimum shipping charge is $5.00!
Music Boulevard is also sort of an online music magazine, heavily sponsored by MTV...
The shape of things to come: Different Drum is just some guy's site. Cool.
Mass Music is another good one.
Or, try CD Universe. CD Universe says that if you like InSoc, you'll also like Weird Al Yankovic. I really can't support this theory.
I've also had good luck with CD Connection
Tower Records has an online store now... and I have to admit, it's pretty impressive, although the RealAudio clips server they're using has all the songs mixed up.