Sometimes sewing machines come with small extension/quilting tables; Velerie’s Bernina 1130 did and if you have a Janome with a quilting package then they will too. The table is very useful for keeping the fabric flat and particularly useful when machine quilting.
If you don’t have one then The Cotton Patch have an efficient and cost effective relationship with a US manufacturer to provide extension tables (in a mixture of sizes) for most machines – older and new. You can contact them at www.cottonpatch.co.uk/?