How to estimate repair credits?

[Manas M.]

So after looking for a while, we are under contract for an investment property in the Birmingham, AL area. I got an inspection done which came out, IMO, with no major issues but several smaller things like caulking, missing smoke alarms,  a sub panel that may need upgrade, couple of pier supports, etc.

I am curious to know how do the experienced folks here go about getting repair estimates based on such reports? Reaching out to individual contractors, electricians, handyman could be one approach but that would take some time. 

I have been suggested to use consulting service of a property management company but I don't really think that makes sense financially because of the smaller repairs that are required.

Anybody used an online service which could help here (perhaps give average repair cost of typical items)? Most I have seem would try to connect you to local contractors which are more suitable for when you want actually want to get the work done, not just trying to estimate a ballpark budget.