^I've heard Shumway isn't that prestigious. It's supposed to be good learning-wise, but it doesn't look that great on college apps as it's just another program you pay for.
goodjams, there are a few, my D is doing Summer@Brown right now, that's one. Columbia offers one also. CTY has several. All cost quite a bit but I know Brown and CTY offer need-based scholarships.
Once you're a rising junior there are a lot more options.
I did go to the Stanford EPGY course this year, and it was alright. Not amazing, but just okay. I'm not sure if EPGY courses are considered good enough to put on college applications though.
I would suggest emailing the professors of nearby universities. Of course, avoid higher-level colleges (Columbia, Cornell, etc.) because they'll be less likely to respond (but feel free to try).
To get my chemistry mentorship, I emailed a professor of a nearby college, and he's been willingly mentored me for over a year.
