Any recommendation for an entry-level Function Generator?

[imJonWain]

You could also build this.  I have a decent function generator but I end up using this most of the time for quick tests.  I built it out of scrap parts on a vero board.
http://www.valvewizard.co.uk/siggen.html

[GGBB]

This is about as "entry level" as it gets (unless you want to build the kit yourself)

https://www.allelectronics.com/item/sgm-1/8038-signal-generator-module/1.html

Even cheaper in kit form. We all know how to solder right?

https://www.allelectronics.com/item/kt-sgm/8038-signal-generator-kit/1.html