Susan - Do you care if the watch looks like a genuine AP or is a particular design feature more important (even if it looks fake)?
In the case of the former, I would take a trip to your local AP dealer/store (or website) & find a model that you (or your son) like. Then, peruse the recommended dealer listings here on RWG for a similar watch (I would start with Andrew (TrustyTime) & Joshua (PerfectClones)). Some of the dealers can often find models (based on a pic that you email to them) from their distributor or factory that they do not normally sell.
In the case of the latter, just look through the dealer websites & select whatever watch you like.
I would also recommend that you read the dealer's warranty/return policy, as they tend to vary by seller.
NOTE - I think it needs to be said that if you have upwards of $750 to spend, I would seriously consider a genuine (mechanical) watch like a Hamilton or Seiko. Spending more than $200-$300 on a rep, especially for a relatively young guy (& 1st rep purchase), may not be the wisest move or the most efficient use of your money. With a rep (regardless of the purchase price or seller), you are most likely getting a used/unserviced movement that will sooner rather than later require service. Whereas, with a gen watch, you have a new, properly working movement that is guaranteed to perform as advertised & it is relatively easy to get warranty repairs (without having to ship your watch back & forth to Asia).
If you decide to go with a rep, please read this 1st.