Amazon has the iPower 4" Inline Duct Booster Fan (GLFANXBOOSTER4) for $15 with free shipping on $25+ or with Prime. It features a 100 CFM air flow rate, 2,930 RPM speed, and 5.5-foot grounded power cord.
Has average Amazon Reviews.
Amazon has the Fractal Design Meshify C Mid Tower ATX Case w/ Tempered Glass, White (FD-CA-MESH-C-WT-TGC) for $71 with free shipping. List price: $100. Has good Amazon Reviews.
Amazon has the Honeywell Programmable Timer Switch, White (RPLS740B1008/U) for $26 with free shipping. List price: $50. It features three operating modes, up to seven programs per week, and compatibility with up to 1,800-watt lights and motors.
Has excellent Amazon Reviews.
Amazon has the Excelvan SF-920 3.5mm Desktop Condenser Microphone with Volume Control and Tripod Stand for $20 - $16 off with coupon W47GUA6I at checkout = $4 with free shipping for Prime members or on $25+.