Well, shops are selling at an average of $24/$26 nowadays. Adding $10 to $12 is still cheaper . And besides , if you aren't lazy enough to find stringers that don't string at shops , stringing services are way below $10 .
Yes , we can said that
but in term of convenient such as MONEY( use transport cost to deal with u and go to the stringer place) and TIME ( need to find other stringer that provide service less than 10 dollar and time to deal and meet with u)