The only true 'mc' tent out there that I know of is this one:
As has been said: You get what you pay for.
Remember the Bell helmet ads from the 70's?
"If you have a ten dollar head, buy a ten dollar helmet."
Granted, we're talking tents here, but the principal rings true.
If you're gonna use 3 times a year, go to walmart. If you're gonna use it more, head to REI or MEC.
Eureka site has blems for sale cheap from their site. Good deals.