Welcome to SRP!

Straight razors tend to be generally more expensive than DE ones, but it's not prohibitive or anything, it's the same order of magnitude anyways.
You've probably figured it out already from other posts but the cheapest options are either a vintage razor from the classifieds, or a double arrow or wapienica which can be had in new condition for $15-$30.
What really matters is that the razor has been sharpened by somebody who is experienced at this. Of course coming from SMF you probably know this already - there is straight-razor expertise there too.