MK stopped making kits about 3 years before they closed their doors. The limited availability and prohibitive cost of contest grade balsa made it difficult (if not impossible) for MK to maintain their extremely high standards and keep prices reasonable. I don't think I've ever seen a flaw in any piece of wood in an MK kit. Plus the continued strength of the Yen against the dollar would make kit prices quite high here. I believe MK was looking into converting their kit manufacturing process to laser cutting (with the exception of the few specialty wood pieces found in every kit) about 5-6 years ago. The cost of upgrading their equipment plus the declining interest in kit building probably also contributed to their decision.
I have not seen a Eureka short kit, but at least there is still a wood alternative to some of the MK classics.
-Will