So, I've been trying to work towards the Australium Grenade Launcher. I was BLACKwondering if anyone knew about a site or program that can view my inventory, allow me to take items from it and put them onto a grid or something, and have it calculate the price in keys.

I agree with you. Off topic, My only problem is in some maps, the freeday script glitches and spawns you in the ground. Then when you suicide you lose your freeday, and then freekilled by a guard who doesn't know you should've had a freeday