You could consider CLING Rubber Cushion

No adhesives - No tapes

The cling rubber cushion just clings to the Acrylic bases and peels away
with ease. Easily re-applied, or stored (try empty CD ROM Jewel cases).
Supplied in sheet form for backing your own unmounteds with pressure
sensitive adhesive on one side ready to accept your images.

See -- http://www.joroco.co.uk/stamp1.htm for photographs and
information