Man, I hate presales sometimes.
Clicked over to the Rush tickets presale page, clicked to get to he show I wanted (Tinley Park), and went through minutes of "No tickets available" messages. Finally was offered section 205 about halfway back, then lost them (connection timed out) and had to start again from scratch.
I had heard they released tickets slowly and somewhat randomly, but I was surprised to find that a minute or so later, I was offered 20th row in the middle for the front section, 103. Score!
The only drawback is that the show's still five months away.
If you weren't so lucky, try seeing what Rush tickets are available at Stubhub.com. Check the Rush Tour Dates list here for other dates.