The cost difference is not a lot (about $70) to get the interior coating in light blue. That kit is available at on our store as Inside Jeep Colored Coating kit.
Note: This kit (like most of our colored truck bed kits) is a two part process. You will first be applying the base coat in light grey, then applying the topcoat of light blue. We also offer a tintable bedliner kit which we could provide a modified version of in the more flexible interior coating product and also provide the tint for you. The second option would end up being applied slightly thinner, but would still provide bedliner quality protection for your Jeep interior. You would also not be able to control the texture as much as by using the 2 step interior coating.