The first target of $80 donated was reached, and I have now purchased an Inkbird ITC-306A, which I added support for some time ago, but has never fully worked. This device has two temperature settings, a low and high temperature threshold, so is represented as a temperature range in HA, but there seems to be some problem setting it.
The breakdown is:
Amount raised through Paypal: $75.
Paypal+Buymecoffee fees: $10.52
Amount raised through Stripe (after buymecoffee ended Paypal support): $5
Stripe+Buymecoffee fees: 0.70
Total available: $69.22
ITC-306A purchase: $65.99
Remaining funds: $3.23.
I've set the progress towards the next goal to $4 to reflect the remaining funds.