I found a Ken Rockwell comment on film processing ...

"Why we love film"

Which says in part,

"35mm Film vs. Digital"

"A frame of 35mm film, scanned cheaply at a good photo lab to a CD,
is about equal to the resolution of a 25MP DSLR."

Somewhere else, he might mention Costco ... but not here. 

He does mention North Coast Photographic Services which offers to scan 35mm ,,,

• ENHANCED SCAN 35mm 3339x5035 pixels

• BUDGET SCAN 35mm 2048x3072 pixels

• PREMIUM SCANS FROM SLIDES & NEGATIVES
  35mm slide/negative Premium Scan @ 3339x5035 pixels

That's 16.8 Megapixels; 6.3 Megapixels, and 16.8 Megapixels. 

That's not 25 Megapixels. 

Comments, please ...

--MGD

p.s. NCPS mentions Ken Rockwell.