I ask that question because ...

1) Frame size is very important. Men especially seem to have an inclination toward huge frames even if their inseam length is no more than mine (an average sized girl). I know of a few who have been somewhat surprised to discover that the bicycle that actually fits them, and is comfortable, is a fairly small bicycle. There's no point forking over a bunch of money for a "good deal" if you've got to ride with the saddle as far forward as possible and resting on the top tube because the frame is way too big and there's no room for adjustments, or if you've got to buy an extra long seat tube because the frame is too small.

2) I personally struggle with the reach on bicycles, and I'm sure there must be others out there with the same problems. I have a very short torso, and bicycle manufacturers (even those who produce small bicycles) have a tendency to make very long top tubes. Then bicycle shops like to put the longest stems on them as possible, so that the handlebars are so far in front that I can hardly reach them. That's something you have to get on the bicycle to check. No point buying a bicycle with a setup like that, where you'll be riding around with arms fully extended all the time. If that's how the bicycle is set up, you can negotiate with the shop to change the stem for a shorter one ... and that is part of the "is this a good deal or not" question. If the shop won't change anything to make the bicycle more comfortable, then maybe it isn't a good deal after all.

Those are the two main parts of the question, however, some underlying parts might be ...

3) A good bicycle shop will take the time to go through a bit of a fitting with you. If they don't, are you sure you want to deal with them?

4) Do you know how to do your own fitting, or are you planning to buy a bicycle that looks approximately right and just start riding?