I ordered replacement tubes (plus O-rings and washers) from IBTanked on Tuesday (three days ago). It seems like mine will be one of their last orders. The IBTanked website now says that they are closing the business but a backlog of existing orders will be filled soon. They also offer the option of canceling orders by phone. I'll wait out the order. I should have enough IBTanked supplies to last me for many years. Sorry to see IBTanked go away.