Intense summer programs for tennis players over 18?

I'm looking for an intense tennis summer program for players that are over 18 or that include players up to 22 or something. I know the bolleteri summer program does but paying over 4,000 for an experience that I've read isn't worth it for a player of my caliber doesn't sound like a good idea. I don't play college tennis (I go to a D1 school) but had opportunities to play at least D3 or D2 and chose not to so I'm not terrible. I'm just really looking to improve my game as much as I can and reach my "ceiling". If you have any positive remarks or advice let me know thanks!