I've had several donations to the loaner set that have been very generous. A Monolux 4380 (HOC), an early Meade 300 (Towa 339), an APL Shrine-Manon, an RV-6, and a Unitron 114 OTA. I'm very thankful that I can share them with my students, and that they helped me get the number in the set up to the point where I can cover a class with some flexibility for students with different circumstances. Then there was the donation to the school of C11 s/n 4, and subsequently the donation of an Exploradome to house it.
A few of the ones I've bought for the set have also been good deals (e.g., an APL Shrine Manon for $35, an 8" f7 Dob for $100, and an HOC Selsi 247 for $100).