The Mini Festive Lord Faren is currently available for 500 gems. As it is a minipet and miniatures are always available for 350 gems I guess (and hope) this is a bug as I see no reason why it’s price is nearly 1,5 times higher.
Although Mini-pets are usually 300 Gems, special Mini-pets can be 400, and yes, even 500 Gems when introduced.
Here’s a list of past Mini-pets and prices: http://wiki.guildwars2.com/wiki/Gem_Store/historical#Toys
Not a bug. Good luck.
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