If you're not opposed to the idea of a personal refurbishment (with the high availability of disassembly guides and manuals).
A replacement fan + thermal paste + replacement speaker should chalk up to no more than $20 with shipping inclusive on taobao (check the Lenovo CRU/FRU IDs). + Isopropyl alcohol from retail pharmacy total bill of materials should be <S$30, maybe add an inexpensive paintbrush for dusting small areas..
+ Servicing time required. But this also depends on personal proficiency with DIY-repairs.
If the machine lacks an SSD, its also a good upgrade option. They're at about 40-50cents/GB currently if you don't mind the drive cloning or reinstallation of windows.