You're at the point (about 4/32") where I typically want to replace the tires. Especially in Florida, where you are subject to intense downpours and lots of standing water, I would want to keep fresh tires on it with good tread depth. As another poster said, the cost of more frequent tire replacement isn't that significant when spread out over time.
The suggestion of waiting until a Black Friday sale is a good one. You're in the perfect position -- you apparently have the money to do it, and you still have some time left before they really become unsafe -- just sit on them for a bit and wait for a good sale to come up.
The suggestion of waiting until a Black Friday sale is a good one. You're in the perfect position -- you apparently have the money to do it, and you still have some time left before they really become unsafe -- just sit on them for a bit and wait for a good sale to come up.