10K+ bought in past month. Amazon with Nicetown has the NICETOWN 42"W x 63"L Solid Thermal Insulated Grommet Blackout Curtains/Drapes (Black) for $9.98 with free shipping on $35+ or with Prime.

Alternatively, check out:

•  MIULEE 2 Panels 40" x 63" Blackout Curtains for $9.97