I find it's very personal, and dependent a lot on your goals, resources, risk tolerance, location, experience, etc.

.: I would go HELOC for sure that would be best as others were saying the lower cost for the money changes between paying a higher rate for a personal line and typically personal lines they want a higher monthly charge as well independent from the interest rate.  

Or a personal loan if interest rates aren't cost prohibitive?

Caution:  Personal credit card financing is a huge risk and good luck finding 0 percent interest today.

Over time, we have developed systems to handle these situations as effectively as possible.

I would be fine with a $10k non-refundable retainer and $500/hr. personally.

Personally I’ve got the majority of my assets in real estate.

Quote from @Dominic Mazzarella: Quote from @James Wise: TikTok is supposed to be shut down in the U.S on 1.19.2025 unless the Supreme Court blocks or delays the U.S. ban per Trump's request.I won't pretend to have any idea how the inner workings of the data collection between China and the USA effect the world, but on a personally business not, I like it.

Buy it personally, and rent it full time to my C-corp?

Better option for personal use but perhaps not rental.