Refresh Optive MEGA-3 has been on backorder at Allergan for some weeks now.
They are currently expecting it to be back in stock at the beginning of may.
Some people have posted online that they weren't able to find it in local stores, but there's plenty online and it hasn't been on backorder near long enough for most bricks-and-mortar stores to run out. As of today (4/17) we still have a few but will be out soon, but other online stores seem to still be fine.
We'll keep you posted if anything changes!