It's definitely worth considering less obvious ways of picking up a "new" tent.
When we were looking for a bombproof mountain tent for high up winter antics in Scotland, it became very apparent that 4 season nylon has some sort of platinum weave through it...they're all very very expensive. I was patient and managed to track down a lightly used one on ebay for about a third of what I could find online.
After two summers of also using the Super Quasar for year round camping duties, we got bored of lugging around 4.5kg everywhere, so started the hunt for a lightweight 4 season which we could use on mountain tops and remote areas in all but full on winter weather. Again though, even though not looking for a geodesic 4 season, the fact that we wanted lightweight 4 season meant the cost was going to be equally daft.
By chance, after spending quite some time looking at Lighwave tents, an ultra lightweight version of one of their top 4 season tents appeared on Sportspursuit for about 55% off. At around 2kg, it's a noticeable improvement for summer stuff!
Moral of the story...do your research, identify the ones you want, then broaden your search as far as possible. Call up a few places and see if they have any old stock they want shifted, scour ebay and gumtree etc.
If you need one asap then this won't work mind you!