Ironhalo.net have released new bases and are also having a sale.
From their announcement:
Firstly we are moving soon, so have decided to have a sale to clear some stock to make it easier for the movers.
Until the 28th of March, everything is at 20% off, just use the coupon code WEAREMOVING2010 to get the discount at checkout.
As part of our completion of all our existing ranges, we have completed two more sets. We have completed our base inserts (small, medium and large) for both the Tauran Refinery and Desert Mesa Ranges.
They can all be seen here.