Head on to Target! This is the second round of clearance for whatever still remains on the floor. I've just got the Watto's Junk and Imperial Shuttle for $17.90 each. The other sets are almost 50% off their original prices.
The sale doesn't apply to the newer 2002 sets.
KB has the sets that sell for $4.99 on sale as 3 for $10. I was able to stock up on Gungans but didn't find anymore Biker scouts.
WalMart has the B-Wing for $20, MTT for $35.