If you can't get to a roller center, try an ice rink pro shop. Both sports require that frames, plates or blades are centered under the foot properly for balance while skating. The boots are similar and sometimes the same for ice and roller sports, and many of the mounting techniques are the same, too.
Remember that mounting skate boots to frames is a balancing act as much as a mechanical assembly. Make sure to get someone with skating knowledge and the proper center line marking or skate balancing capabilities. A skate frame that is assembled but not aligned properly under your foot can cause a lot of unnecessary problems.