Spontaneous Christmas Carol Singing with the Roll-up Soft Ke

Last week I was invited to a SantaCon Christmas party where EVERYTHING was into place (foooood!), except that they had Lady Gaga blasting over the speakers. Good thing I brought

my roll up keys, so we ended up caroling. I bought these keys online, but I`m looking for more roll up keys like these, maybe some other brands. Anyone has any suggestions?