Some of the other guys who had kids drafted out of HS might know better but I would assume if your son was under draft consideration you wouldn't need to be dropping big $ on showcases during his senior HS season.
I know in 2019s case he was invited to free workouts and pro days but he was not game ready nor was he on many radars as anything other than a late round flyer. The showcases that were charging posted rosters with guys who were clearly not draft ready. Appeared to be money grabs. Pro teams still came to see him the spring all the way up to his last start before the draft.
But more importantly, this is the only job for scouts. I would assume if they were reasonably interested in a player they would be at the majority of his games getting whatever info they still needed. In other words, you wouldn't need to showcase. I figure in OPs case, if her son were a slot guy (1-10 rounds) they would already know this.