Buy the tools and do it yourself. Replacing sights on a Glock is super easy. You'll be money ahead in the long run.
Zr tactical
If you can't get into ZR, I'm still a master armorer and have the tools.
If none of these work out, you can also go in to Tim's Shooting Academy, they have armorers on staff.
Tell her she is muscling in on my territory!!My 2 year old is a Glock armeror. She takes Clementines as payment.