Target's still holding to the sticker price of $150 for the 300 around here. The 600, which was discounted, is sold out. There's still 3 of the 300s at the store, locked-up inside a cabinet.
Apparently Target markdowns vary from store to store. I've printed the 300's UPC on a piece of paper, that way I can hit a scanner to check the price without walking across the store to the electronics section.
Even though the 300 is now discontinued, at $75 it's still a great deal. I'll check again on Monday, which is supposedly the day for electronics mark-down.