I got mine from ebay.
It cost about £75 inc delivery.
It gets regular use from 2 very active/athletic cats (Egyptian Mau and Bengal). Both of these cats are around the 3KG mark, so they are not too heavy yet. The tree does shake when they are galloping up and down it And when they are fighting, the tree shakes quite violently.
Its about 8 feet high, but as my ceilings are higher, it doesnt touch the ceiling.
So far, I'm very pleased with what I bought and the price was excellent. Zooplus, et all are rip-off merchants. Their profit on these items must be significant, bearing in mind that I only paid £75 for mine, which is a larger item than anything Zooplus have.