At Amazon, get this 120" Outdoor Projector Screen for $50. It's the best price Amazon has charged for this model.
It comes with a stake-down base, rust-resistant steel bracket, and windproof ropes for outdoor setups, along with a carry bag for storage or travel. You might also be able to use an Amazon coupon on this deal.
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Features 120" screen with a 16:9 aspect ratio 160-degree viewing angle for multi-person viewing Widened, thickened base plate with ground stake holes Includes four ground stakes and two windproof ropes Tool-free setup with modular splicing tubes Folds down into an included carry bag weighing 1.4 lb.