I wouldn't pay a lot and there is of course a risk, depending on a lot of things. Such as whether the shipper is honest and sends fresh eggs, how they are packed, how soon you can pick them up from the PO and the weather. IMO now is a good time as temps are not to cold in some areas of the country. Early spring is another.
I would post who you are getting them from and see if others have had good or bad luck with them.
Oh yeah, your hatch depends on how good you are at hatching with your particular incubator. I've posted this before but I'll post it again. I have a copy of Incubating from Practical poultry magazine that helped me alot. I can mail it to you or fax it to you and I think I can figure out how to e-mail it to you if you'd like.
Wishing you a sucessful hatching experience
Rancher