Browsing through the Walmart.com inventory, they have a number of large discounts on the larger Star Wars sets, as well as various other $100+ items. Here are some notable deals:
>>10188 Death Star is $357.89 ($399.99 MSRP)
>>10221 Super Star Destroyer is $335.99 (MSRP $399.99)
>>10225 UCS R2-D2 is $151.19 (MSRP $179.99)
>>10217 Diagon Alley is $125.99 (MSRP $149.99)
>>Modular Building Series is around $120 range ($149.99 MSRP), though most are sold out online.
>>(10224 Town Hall is $161.97 (MSRP $199.99).
>>10231 Shuttle Expedition is $78.27 ($99.99 MSRP)
>>10220 Volkswagen T1 Camper and 10219 Maersk Train are $99-100 (MSRP $119.99)
All of these qualify for $.99 Shipping or free Site-To-Store Shipping, though I've heard some troubling stories about Walmart's shipping quality. Amazon.com has already price-matched some of these like 10231 Shuttle Expedition, 10224 Town Hall, and 10225 R2-D2, and they also qualify for Free Super Saver Shipping.