I know that there are many examples of players being recruited without attending a showcase, but typically these players have had the opportunity to play on a relatively high profile tournament team that hit the East Cobb, Jupiter and Ft. Myers tournament circut.
I think that to hope to find a home for your son without utilizing one or both of these options will prove to be a very difficult challenge.
Even the JUCO route, if one hopes to transfer to a D-1 or D-2 will require significant efforts at recruitment. The stronger JUCO's are extremely competetive for players, and once there, the player will find an extremely competetive situation for playing time.
The PG Underclass event in Ft. Myers is tremendous and hard to beat for exposure. In spite of the financial outlay, it really does provide a significant "bang for the buck".
In our case my son played year round in Florida and played on Travel Teams and did the showcase circut. He was fortunate in that he was respected and thought to be a valuable player. If we had not ventured outside of North Central Florida, I am not sure he would have found his opportunities.
It is expensive, it is also very enjoyable. It was our family's vacation experience.
If you can not do both, or if one is not available (as in the case that there are no travel teams in the area), I would have to encourage you to go to PG showcases such as the Underclass and World Showcase.
If your son has never participated in a large showcase, it may be helpful to find a smaller cheaper one to get a sense as to what is expected. Blue/Grey, Pro Day, Next Level... these are good in their own right (Next Level especially), but perfect for getting properly geared up for a big PG event.
Opportunities come from these events. There are cheap hotels in Ft. Myers. It was worth it for my son, perhaps for yours as well.