Supplier Page from Thermo Fisher Scientific for Yttrium rod, 12.7mm (0.5in) dia, 99.9% (metals basis excluding Ta)
Ethyl 2-bromoisobutyrate, 98% from Thermo Fisher Scientific
Ethyl carbazate, 97% from Thermo Fisher Scientific
Ethyl cyanoacetate, 98+% from Thermo Fisher Scientific
Ethyl propiolate, 99% from Thermo Fisher Scientific