lowering questions

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let me first of say hi guys im new to the forum.. just sold my 92 dodge stealth twin turbo all wheel drive and am buying a 68 gmc long bed... i have been doing some research on lowering the truck and this may sound odd but what is the cheapest way to lower the truck 4 or 5 inches?

i looked and found a kit for 600 i belive was a 4 or 6 inch drop but then i looked at air bag setups... i believe (correct me if i am wrong) i found one for 1300? but how much room does the setup take from the bed area?...

so in a nutshell...
1. whats the cheapest way to get lowered?
2. how much room does the air bag setup take in the bed?

Thanks in advance
Josh