Edit: The gift card deal at ebay is back on and the tents are still on sale.
Cabela's currently has the top-rated Kodiak canvas deluxe 10x14' tent [cabelas.com]
on sale for $500 (normally $650). But if you prepurchase 5 of the Cabela's gift cards that are on sale right now ($80 for a $100 gift card) in another SD thread
and purchase your tent with these by 3/22 (UPDATE: the sale is still on as of 3/23), then you can get your cost down to $400 + free ship to store (they say they offer $5 shipping right now, but for this heavy item, they add a $19 surcharge). Note that in the gift card deal, they send out the gift cards by regular mail, so there is a chance you won't receive them in time, but I'd think you could easily resell them for what you paid for, if you want to take that chance.
Other sizes of Kodiak tents are also on sale: the 10x10 [cabelas.com]
for $399 and the truck tent [cabelas.com]
Note that the Kodiak tents rarely go on sale for this low of price. They are for car camping because they are super heavy, but super sturdy as well. The reviews will tell you all you need to know and there are many video reviews on YouTube as well.
If you don't get your gift cards in time or it's too late to order them, you can still get a pretty good deal on your tent by having Competitive Edge Products [competitiveedgeproducts.com]
price match Cabela's, and as a bonus, they say they'll beat the price by $20 and throw in a free tarp to match your tent. Or I think you can opt out of the free tarp and they'll credit you for it. Get the details on the price match in last year's SD thread about a similar deal
. Also no sales tax here for those living outside of Utah.