Hey!
We've primarily moved to Stripe for donations. There's a link at the bottom of the ITFlow.org site for one-offs, thank you in advance - https://donate.stripe.com/6oEbK92lH08feys3cc
Regarding the monthly sponsor support: I fully appreciate that $60 can be a lot, but we're basically committing to providing timely, private support for that. It's targeted at slightly more mature MSPs that want to use ITFlow but need an assurance that support is available as required.