There are two sizes of plaques that can be burned with almost anything (anything under copyright must be checked, and any paperwork relating to the copyright must be shown)
The sizes are:
145 x 295 mm (5 3/4" x 11 3/4"), or,
145 x 375 mm (5 3/4" x 14 3/4")
The current prices are £12 and £17 respectively, and includes UK postage. Overseas postage is an additional £5.