Man, you never realize just how messy your place is until you take photos of it! This is my solution thus far for a racing cockpit...outside of the G25 itself it cost me just a little over $100 and does the job just fine.
At its core is an AK Rocker I got years ago. I'm willing to bet you can find one for less than $60 if you shop it up. The only issue with it as a racing chair is comfort (longer periods upright tend to be an issue) and the fact that it, well, rocks. Physically.
A spare set of dorm bed risers I had leftover from college did the trick of keeping the chair upright when it's in use. $15 for the set of 4.
I got lucky with the table. Because the AK sits lower than a usual chair, a 24, maybe 25" high snack table was not cutting it for racing duty. Even if it was the right height, I only had about a foot of room between the table legs. It was quite uncomfortable and made working the clutch a nightmare. I lucked out and found this dual-height table at Walgreens for $20. The lower height (20.5") was absolutely perfect.
And without copious amounts of these, the cockpit would not hold together at all. On the left is a bunch of drawer mats; the rubbery, anti-skid kind ($5 for 6sqft). Works wonders in keeping the wheel and shifter soft-mounted without slipping. On the right is a 3/4" sheet of dense foam I had leftover from a DDR dance pad, but you should be able to find something similar for under 10 bucks. You can also substitute cardboard or some other material; it serves double duty here both as a way to make the G25 mounting easier and as a shock absorber/sound deadener shoved into the top of the dorm risers.
It's not the most elegant solution in the world, and it still leaves a proper shift mount to be desired, but the cash outlay in my case was low so I'll deal with it. But of course, I had to go out and grab one last thing...
This $50 Black and Decker mini-fridge is perfect for keeping 6 bottles (or up to 12 cans) of beer nice and cold for those longer gaming sessions. Plus, once I figure out the shift mount, it'll be my faux center console.