Make It Yourself
No need to spend a lot of money to stay fit. It is very easy to construct your own suspension training straps, less than 30 minutes, that function just as well as the commercial ones, and the total system costs less than $20. In addition, if you do like using the straps or no longer use them, the parts may be easily dismantled and used for other purposes. If you find that you use the straps a lot, want them to look classy, and don't mind spending $200 to fit in with the crowd, you can always buy a commercial set.
Some type of hand saw.
Staps. Three (3) moving straps rated for a working load that meets or exceeds your body weight. I used straps with a 750 pound working load (gives you a large safety margin) obtained from a Harbor Freight store (2 pair at $4 a pair).
PVC conduit. Eighteen (18) inches of 3/4" PVC conduit. I got mine from a Lowes Home Improvement store for $1 for 5 feet.
Connection device. You can use a 1/4" Quick Link from Lowes. I used 2 "D" Rings I obtained from Harbor Freight for $3. Whatever device you use, it must have a working load that meets or exceeds your body weight.
3/4" friction tape. A 60' roll from Lowes costs less than $2.
Quick links. Two (2) 1/8" Quick Links from Lowes cost less than $4.