Some foundries offer the standard BI BI Bold Expanded for free for personal use. You pay only for commercial licensing. Always check the readme.txt file. If a site asks for a credit card for a "free" font, run away.
Since no canonical "Bi Bi Bold Expanded" exists in major type libraries, this paper treats the name as a case study. If you have a specific font file with that name, inspect its metadata and license file before commercial use. For a true expanded bold free font, I recommend Archivo Black or Anton with CSS stretching. bi bi bold expanded font free
You might wonder, "Why not just stretch a regular font?" Never manually stretch a font; it distorts the stroke weights and curves. The BI BI Bold Expanded font is mathematically drawn with specific side bearings and proportions. Some foundries offer the standard BI BI Bold