First of all, it was brought to our attention by another poster here a day or two ago that this model is out of stock and not appearing on the TracFone site. So we can assume it's going to be hard to get for a while.
Second, putting in your home zip and relying on TracFone's site to recommend a phone is not a reliable way to get the best service for your area. The best way is to know, through independent research (looking at the correct carrier's coverage map) who covers your area the best (home and the places you frequent). Then, using a zip code that equates to pointing to the desired carrier, enter that in their site selection area. Here on Howard Forums you can ask and obtain a zip that'll get the job done. It usually boils down to wanting (or needing) AT&T as opposed to T-Mobile (GSM carriers), with the possibility of Verizon wireless (a CDMA carrier) where it beats AT&T. The CDMA phones (whose model numbers end in "C") are fewer in number to choose from. The GSM phones (like the EX124g) end in "G". These are the primary underlying carriers that TracFone has agreements with to have their phones work on, as TracFone (and sister companies Net10 & Straight Talk) do not own or operate their own physical cell network.
The zip for ordering does not have to match the shipping zip or the activating zip.
So, who's the best carrier for your area? Check out the coverage maps for AT&T, T-Mobile, and Verizon Wireless on their respective sites. T-Mobile typically comes up a distant third place, although there are exceptions.
The business with a retailer not having accurate info about what's in stock is just (I guess) the way things are in the online world. And of course their live cust. svc. people all want to say "yes" to please their customers. Kind of short-term gratification there, isn't it? Better that they have accurate, truthful, useful info.
Just post again if you need more info.