So far, the best deal I have found is $50 off at Staples. Order online, free shipping or in-store pickup. Looks like 2nd day delivery for iPad Air 128GB Verizon Space Gray. So if their online inventory system is accurate, they have it in the warehouse.
Verizon has $100 off MSRP — if you sign a 2 year contract, but it is on backorder, 7-10 days wait. If you want prepaid $20 for 1 GB/month it is full price. Postpaid $30 for 2GB/month with 2-year contract, $100 off list price.
Otherwise, everyone is at Apple MSRP list price. Target does not stock it. Walmart may have some in the warehouse.
Of course, you can also go to eBay or Amazon and pay a lot more than list prices.
Update: The Apple website sure makes it easy to specify variables and check availability in Apple stores.