Like Matt said, www.autoperformanceengineering.com has the walbro for $105 shipped. Great deal.

Dejon Tool or RRE has great 2G upper IC pipes.

Hallman MBC is $45 at www.boostcontroller.com

For all gauges, go through Summit. They are the cheapest I've seen and always reliable. They ship fast too.

I got my A pillar from Alamo Motorsports a while ago. Not sure if they still carry them. Summit should have those as well.

So, recap:

www.autoperformancengineering.com (Walbro pump. Make sure it is NOT the High pressure one)
www.dejontool.com www.roadraceengineering.com (IC pipes)
www.boostcontroller.com (boost controller....duh)
www.summitracing.com (gauges, maybe a-pillar)
www.alamomotorsports.com (a-pillar, turbo timers)