Which brings up another benefit of using an online eyewear vendor: they let you type your own prescription in. If you are personally fine with using a two-year-old prescription, do it.
When I ordered glasses a year ago, I also played around with the idea of eliminating astigmatism from my prescription by adjusting the cylinder value to 0 (it was only .25 in one eye and .50 in the other) and offsetting the sphere value by half of the difference. Because their buy-one get-one free sale, I got one pair with astigmatism and one without, and got to decide which I liked better.