You really should go by the W-2 if you can get it soon. There's often some additional information on it, but there is a way to file a mailed paper return without it as a last resort. I'll mention a bit more below.
But if you want to lock in the early-season price, we can tell you how to pay in advance for your Online product, if you wish. This is the last day for the discounts. Prices go up March 1. I'm not sure if that's at midnight tonight in one's particular time zone, midnight tonight Pacific time for everyone, or what.
[ADDENDUM: I went ahead and left the instructions to pay in advance in my next answer that follows this one.]
The early season discount savings is "up to $30", so it varies depending on the product.
Have you contacted your employer (or payroll services provider) to inquire about your W-2 and asked for a replacement copy? One is supposed to contact the IRS if a W-2 was not received by mid-February, and if still not forthcoming, one could go ahead and file using a "Substitute W-2" that TurboTax prepares on a special screen for Form 4852, but then the return cannot be efiled; the return would have to be printed and mailed.
[ADDENDUM: I left some additional comments and 2 FAQs about a not-received W-2 in my next comment below. I also went ahead and left info on how to pay for Online TurboTax in advance, if you wish.]
