Dragon Forge Design have released a 200mm x 155mm Slate Wasteland Base.
From their announcement:
Today I added a new 200mm x 155mm Slate Wasteland Oval Base to my store. This is a very thick base at about 30mm thick and is very heavy. Perfect for large flying models when combined with one of my flight stand kits.
You can find it now for sale at The Dragon Forge Store. Price is $45.00
Can be drilled on request to accept one of my flight base stands.
RBSW-014 200mmx155mm Slate Wasteland Oval Base 1 for $45.00