I picked up an Airman Compact on eBay a couple of weeks ago from the UK, delivered for less than $30. They are the same as what you were looking for, but probably not much point in following up. I've heard both good and bad about the Slime, and just decided I'd try one of these as it was cheap, gets good reviews, and is pretty small. Good quality fittings, guage, leads etc, and I've plugged it in and fired it up, but I haven't used it in anger yet.