So they want 4th axis but they won't spend more than $500 to get it?
Do they bid work for free? I would assume that if they have 4th axis work, they're charging accordingly.
It's not worth $2500 to them to have a real 4th axis? Man, I just can't understand some places. $500 is a good vise. $500 is a cheap 8" chuck. $500 ain't a 4th axis.
Tell 'em to get out their stinkin' wallet and buy one.
There's a 9" rotary in Arizona right now on eBay (Item #: 320213766881). $999 and no bids. From the look of the photo, they have a second one too. And they're a liquidator. Call them and make a deal (make sure it's brushless first). You'll be happier in the end and you'll be able to put it to work when it arrives.