Hi Frankiep77,
That’s about as good a price as you could find anywhere and no matter how long it lasts you it would be good “value” as long as it was suitable for you in terms of PPP (nothing is worth sleeping poorly or with discomfort or pain).
If the sides are the same then I would rotate it yes to help it wear more evenly. If they aren’t, then it would depend on whether you are OK with sleeping on the other side of the mattress if one side is better for you than the other.
The better options and possibilities I’m aware of in the Long Island area are listed in post #4 here.
Phoenix