Advice Needed: Printing "Posters" from Personal Photos

[steveroberts]

Hi Friends,

I've got a few pictures shot on my Sony NEX-3, that I'd like to print at 20" x 30", then frame. Since these are for home use, I don't need super high quality.

Questions:

Is foam mounting the best way to get the prints to lie flat in the frame? Or is there a better way?

Is there a recommended online service that can print and mount at a reasonable price?

Any other considerations?

Thanks very much for your assistance,

SR