Just purchased this and highly recommend it

DACCKIT Travel Carrying Case Compatible with DJI Spark Fly More Combo - Fit DJI Spark Drone, 4x Intelligent Flight Batteries, Remote Controller, Charging Hub and other accessories https://www.amazon.com/dp/B073RF595N/ref=cm_sw_r_cp_api_i_ngX5CbJDPQR7C

Just bought a case that holds everything I need, with a semi-rigid clam shell design, that also has a shoulder strap. Spark Case w/ Items

It is the following item on Amazon: https://www.amazon.com/gp/product/B073RF595N/ref=ppx_yo_dt_b_asin_title_o05_s01?ie=UTF8&psc=1

Swap out the guards, 3 of the extra cables, controller guard, and prop lock on the lid side and I'm positive it'll fit a tablet and mount.

EDIT: I like this case because the Spark is recessed in the foam so the rotors are protected from anything in the zipper section that my protrude down while closed.

EDIT v2: This review shows the same case with a tablet and mount secured.