One tip, always print out the TireRack or other online price, as most of the chain stores (and prob the privates too) will price match them or come really close to it. It used to be kinda hard to do, now I find Big O, NTB, Discount TIre, Firestone, they just almost automatically agree to match it. Can call them on phone first and find out who will match etc. Recently got my Mom some Cooper tires from PepBoys...."worked" with the manager for about 2 days haggling over price...finally got a flat fee, out the door price, including tax, etc...
BTW...TireRack and prob the other online sellers, will have the tires delivered to a shop, so you don't have to schlep them anywhere. Just ask your chosen shop ahead of time.
The difference you have to factor in is that with online tires, you have to pay a shop for mounting/balancing, sales tax....and environmental disposal fee, and a few more little fees, "shop fee"...
Try Costco....often have $50 off 4 tires. Can order many tires, but not all...but always excellent prices. No negotiation there however.
Anybody know if Costco offers lifetime balancing....or is it just free rotation? Could use that as a selling point with potential buyer.
Of the people that have shown interest, do they seem to be "stock" type people? Then stock or equivalent type tires will probably be good idea.
Maybe the Bridgestone Duelers (can't remember which 2 letters follow it) that came on them would be a "good" choice in this scenario.
One thing about Costco and the other big box sellers, the tires are going to be "fresh", which in South Florida may be a good selling point as well since you get so much sun exposure.
I agree, putting brand spankin' new rubber on is a huge selling point, rather than the buyer knowing they HAVE to go and get some, no matter how much discount you give them on price...having the new rubber on is a better marketing strategy IMHO.