Supercheap have all their Go Play! Sets for $9 on clearance. RRP for most sets appear to be $35-90. Not sure the quality is the best but they look like fun games that would be well suited to the backyard and camping.
I got the football toss set and plan to use the nets for golf chipping practice. Also got the Bottle Smash set for the Frisbee to do some Frisbee golf.
Football Toss
Bottle Smash
Glowfly Aero Darts
Rubber Horseshoe Set
3 in 1 Set