There are a few Jimboombas out there, but they dont come up to often.
Im not sure how long Jimboomba have been making campers, but up until the last 12 months they did little to no advertising and most of their sales were through word of mouth.
In the last 12 months the company seems to have had an overhaul. They have included new campers into their range, started attending camp shows and upped their advertising.
It is possible that the reason for not many Jimboombas being out there is because they were not to well known and had a small market share, perhaps now they are pusing their product we will start to see more of their campers come onto the 2nd hand market within the next few years.