Yes, they can ship anywhere... It's a matter of HOW they can ship it that makes it cost-prohibitive. Many carriers will not ensure safe delivery of individual glass aquariums, so if these are special-order or 'short-run' items it's a matter of exorbitant rates for shipping insurance, or purchasing multiples on the odds that one arrives safely. Either way, it's a cost passed to the consumer.
If they've got a good system for shipping whole batches here for distribution, however, then it's not a big deal to get one - we retail Giesemann. I should know shortly what the story is.