I know I've shopped with HobbyLink Japan since at least 2002. Combining orders is less insane than it used to be due to a Pile-Of-Loot-like feature called Private Warehouse that they started in 2012, which means you can combine shipping within sixty days of the first item coming into stock. HLJ has a lot more competition than it did a decade ago, but it's still a great option when they have what you want and unlike some other outlets, they never 'scalp' popular items - you'll always pay the right price.