Found this on ebay, that auction has ended and even if you contacted the seller i doubt you would get it befre xmas now but may be worth a try
Graveside - Remembrance Card / Picture Holder on eBay, also, Memorials Funerals, Celebrations Occasions, Home Garden (end time 15-Dec-08 19:33:04 GMT)
Other than that have you tried the bigger florists?? they may do something suitable