What happened to your space key 
I'd apply between that sweet spot of the 17th after Sears reports, but before 23rd when Discover reports with the now higher balance due to the BTs. Especially if there's not much price negotiating room in PR (which seems entirely reasonable), try to close the deal then so at least you get the best rate.
If it's an uncompetitive market, just be careful how low you take your target price. Dealers may simply not respond if it's too low. But you still should be able to play one off of another to a certain extent. Also over the phone works nearly as well as internet, just takes more time. Remember to be firm: you aren't driving down to the dealership till you have a solid price in writing (preferably you'd have a buyer's order before going but I've dealt with highly rated dealerships who were weary to send that...worked out fine anyways.) Just remember you can and should always walk if they pull some BS like extra doc fees beyond what was mentioned, accessories, VIN etching, etc...they'll back down after you walk.