[quote name='gofishn']Bought one brand new at Best Buy for $14.99 about a month ago. Seems to be the standard price now.[/QUOTE]
I lucked out with an ignorant cashier. I gave her one of those $5 off McDonald's coupons for PS2 games, and she took $5 off the network adapter.
I've heard that both K.B. Toys and Target stores have Sony's network adapter on clearance for $5 to $7.50, but I haven't been able to find any in-stock near me. You might get lucky though.