Digikey: 2 MAZ40330MFCT-ND DIODE ZENER 3.3V 370MW DO-34 0.33000 $0.66 1 AT90USB647-16AU-ND IC AVR MCU 64K 64TQFP 9.68000 $9.68 1 438-1045-ND BREADBOARD 2.13x6.496 8.73000 $8.73 Mouser: 20 649-68000-436HLF Bergstik Headers BERGSTIK HEADER 36P 0.48 $9.60