I'm not exactly stocking up, but I'm not waiting for the "low, low post-AWB-sunset" prices to appear. If I can get full-capacity mags for <$60 each, I'll consider getting as many as I can afford(of course, the actual price I'm willing to pay depends on the brand/model of magazine).
The way I see it, even assuming that the AWB sunsets, we're STILL gonna have two kinds of mags, 10-rounders and full-caps. As a few posters have mentioned, certain jurisdictions(CA, NJ, MD, HI, etc.) have laws that mandate 10-rd-only mags, and those laws WILL NOT disappear with the AWB. So, the gun manufacturers will STILL have to make 10-rd mags, if only to sell and ship with guns to those states. Given that these 10-rd mags are now selling for $20-$40 retail, I can't imagine that "post-AWB" full-capacity magazines will be selling for much less than $50-$60 - I just don't see ANYONE, whether manufacturer, wholesaler or retail dealer, being able to pass up the chance to make an extra $10-$20 per mag, especially when they've got customers who'll happily pay $60 for a new-production factory OEM full-cap magazine rather than $80-$120 for a secondhand "pre-ban" mag.
So, since I'm expecting the price of "post-AWB" full-cap magazines to be at least $50, if I can get them NOW for $60 or less, I'll be happy to buy 'em - it's worth the extra $10 to me if I can get the mag NOW, rather than wait 9-10 months for the AWB to sunset, keeping in mind the possibility that the AWB MIGHT get renewed, after all. Naturally, if I can score a REALLY good deal, like $15 "Asian Military" mags for my Beretta 92F, or $8 mags for my SAR-2, or $20 Chinese M14 mags, I'll just about break my arm reaching for my wallet.