I don't know if Guild still has these, but if you need to capo a 12 string, these Guild branded capos are just the ticket. Plenty long enough without having to fiddle them into position.
And, yes, these are readily available on Amazon and Reverb and elsewhere. Just Google "Guild capo".
Maybe not as fancy as the Thalia ones, but it gets the job done for not a lot of scratch. Just your basic squeezy capo.