This Snap & Grow Plus  is a excellant starter greenhouse. This greenhouse is also available in larger sizes, so if you are looking to up grade you can.
 It comes with:
Dimensions
8' 1/2" W x 8' 1/2", 12' 1/2", 16' 1/2", or 20' 1/2" L x 8' 6-1/2" H
Sidewall
5' 3"
Frame
Aluminum with Rigid Polypropylene SmartLock Connectors
Color
Silver
Covering
Clear, Single-layer SnapGlas Polycarbonate Panels
Door(s)
3' 9-3/4" W x 6' 6-3/4" H
Roof Vents
1
End Vents
0
Side Vents
0
Base
Integrated
Foundation
Options - Stakes; Treated 4x4's; Concrete Piers or Slab 
More foundation information
Warranty
Frame - 5 years; Covering - 5 years
Warranty Information
Manual
8' Wide Snap & Grow Assembly Manual