Horn speakers for vintage sound

GIP drivers are extremely expensive, nothing is in your stated price range and they rarely come up for sale used.  GIP drivers are in the same price range as original WE drivers.  Also, they do not so much as try to reproduce WE drivers that employ permanent magnets, all of their drivers are field coil drivers requiring a power supply.

Great Plains Audio makes various reproduction drivers including close of Altec drivers.  They might be of some help.  https://greatplainsaudio.com/

You will probably have to hunt round on the used market and it will not be that easy, absent a lot of experience, to find components that match up well and to build a system.  It will be hard to find woofers that are high enough in efficiency to do justice to a high efficiency compression midrange (if you used an Lpad to drop the volume of the midrange driver, you will be wasting the efficiency of that driver).

Good luck.  

budget horn speakers

It's hard to do big and budget at the same time. How about used LaScalas or VOT. They both offer that vintage horn sound. 

Message me i have  friend who owns a vintage audio store and he has a few options like JBL, Altecs etc that may be of interest. i'll pass his contact information on to you. 

Altec A5 is what you need. 3 way Hiraga crossovers with a super tweeter. Altec 1505, 288 mid drivers and 1505 horns.  I use 7.5 watts tube power and you can’t be in the same room at 50% volume. I augment with horn loaded subs. You could probably be all in for 5K if you shop around.   Super tweeters are Faital pro HF10AK on custom horns and Lpads since they are 110db efficient. It’s extremely live sounding.  Pete Riggle builds Hiraga inspired crossovers for a 3 way system that are hard to beat. If your ever near Dallas, stop by.  It’s worth hearing.