I've done a survey of 2015 City, Friends, and Creator (minifig buildings) prices on Amazon and these are the best deals as of 02-19-2015. I generally only highlight sets with more than 10% off, and sets over $10. As always click the prices for a direct link to the set on each store.
60069 - City Swamp Police Station - 707 Pieces
$10 is nice discount for as new a set as this. I know some people get tired of all the police stations, but I think the swamp setting makes this one a bit more interesting than most.
Click prices to go direct to item webpages
60068 - City Police Crook's Hideout - 473 Pieces
Again $10 is a good discount for such a new set. I like the crook's structures in general, I wish they'd be sold separately from the Police vehicles in official sets.
31036 - Creator Toy and Grocery Shop - 466 Pieces
$5 is not a huge discount, but as usual Creator sets have a good price per part to begin with.
41037 - Friends Stephanie's Beach House - 369 Pieces
Unfortunately none of the 2015 Friends sets have particularly strong discounts at this time. I get the impression that Friends sells very well and doesn't get quite as many price cuts as some other lines. Regardless I decided to highlight a couple older sets that I think are good deals. This beach house has some great details and at 25% off has a very good PPP of 7.9 cents a piece.
41015 - Friends Dolphin Cruiser - 612 Pieces
This Friends set is a particularly nice design in my opinion. I wish we'd see a large yacht in the city line. Though the PPP is nothing special, with the large hull pieces taken into account I rate this a good deal.
