Borrelli delivery times can be very variable. In my order, one shirt came after 6 weeks, while the other took 5 months, and both were part of the same order. $400 to $500 is typical for a Borrelli shirt, but they are certainly better than the stuff that Vacca sells. I don't think it costs any more to do MTO (which is what Borrelli does, not even MTM) than to buy off the shelf.
I think the only reason to buy a Borrelli is that you like its style, and if it fits you. The construction quality is also highly variable and not that great, and the shirts are fragile. I also think hand-sewing is a gimmick.
At their prices, I'd rather look at custom shirts. It sounds like you're near New York City, so if you can't afford Kabbaz, you may want to look at CEGO (look for posts by Shirtmaven, the owner), or Paris or Geneva. CEGO will be the cheapest, with Geneva, then Paris following in increasing order of price. Ascot Chang is also another good alternative, though you have to be fairly strong about your styling preferences with them. The style of those shirts will be very different than Borrelli, but I think you'll be getting a much better shirt for better prices, and they may also be able to incorporate some of the Neopolitan styling cues. I have Geneva custom shirts (through Sulka) that are in better shape after 7 years of commercial laundering than some month-old Neopolitan shirts that have been babied.