You may do it already Gloria, but thought I'd mention using tin foil for lining - it's cheap as chips in the supermarkets, and I use it to line my grill tray under the grid, then when finished, just screw it up and in the bin. If something is liable to boil over in the oven, I roll an edge on the foil to make a tray and put it underneath, then in the bin when done.
The other god's end is reusable fabric cooking liner, which you can buy at Aldi for around £1.60 for a sheet measuring 250x1000mm that you cut to size as required. It's called alio and comes in a green packet. It's excellent for lining baking trays, cake tins, etc. The more you re-use it, the better it gets. Fantastic stuff. Completely non-stick and washes out in a trice in hot water.
Hope this helps - I've always said: "the down-side of cooking is the washing up"! Oh for a kitchen porter that fits into the broom cupboard! 