So this is just a wild estimate to ponder:
Crib size: say about 54" X 36"
At least 2 yards for the top, and 2 yards for the back and binding, so about 4 yards @ $8.00/yard. Even if you use your stash, or scraps it was about this price when you purchased it. ($32)
Thread for piecing and quilting: $3
Batting: $10
Cutting & Piecing 2 days (16 hours) @ minimum wage $7.25 = $116
sandwiching, cutting & binding: 4 days (32 hours) = $232
Materials: $45
Labor: $348
Total: $393
Add in driving to the store for fabric etc. and you can see it really adds up. Very few folks would pay anything close to this for a crib quilt, and what they would pay varies by geographic region.
I have heard folks charging 2 or 3 times the materials amount which would make it $90 or $135, but would you be willing to do all that work for $45 to $90?