Recommended Project Structure for multi-function SAM Template

Question

I have a new project that requires a relatively small amount of services, maybe 10 or less (and therefore it is not economical to place each in a separate project repository). Each service will be defined as an AWS::Serverless::Function via SAM Template. My question is: what is the recommended way to organize or structure such a project?

Currently the structure is:

|- src
    |- lambdas
        |- service-one
            |- stuff
            |- package.json
        |- service-two
            |- stuff
            |- package.json
    |- other-stuff
|- test
|- package.json

Is there a way to avoid having each lambda act as its own sub-project with unique package.json and etc?