See Campout Gear List for what you need.

ALPS Mountaineering
     Manufacturer of good quality gear at lower costs
     http://www.scoutdirect.com (45% discount for scouts, see attachments below)
     http://www.alpsmountaineering.com (selection)

REI Outlet
     Online only discounts on REI gear
     http://www.rei.com/outlet

Sierra Trading Post
     http://www.sierratradingpost.com

GearTrade.com
     Deals on used, closeouts and overstock
     http://www.geartrade.com

Backcountry
     http://www.backcountry.com

Campmor
     http://www.campmor.com

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What to buy

Tent
2-person; REI half dome is very popular; Single wall tents are not recommended due to condensation problems

Sleeping Bag
20 degree; Mummy style is lighter and packs easier

Sleeping Pad
1" to 2" self inflating;

Backpack
Philmont recommends a minimum of 4,000 cu in for externals and 4,500 for internals.
Externals are less expensive, tend to be lighter and allow more air flow around your back.  They are good for open flat hiking.
Internals fit closer to your body and are more maneuverable on uneven terrain and don't snag on tree limbs and brush.