Narrow down your hop requirements to several varieties that you can use a lot of and buy in bulk. What you'll find is that clone recipes may specify certain hops that may or may not be part of the actual brewery recipe. Do some research and simplify the hop schedule. Yakima Valley has a number of good hops for $7/lb right now. And several others at $10/lb.
The best hops for doing the heavy lifting in a DIPA are varieties like Centennial, Columbus/CTZ, Chinook and those are usually pretty cheap. Then there's a level of hops with more specific character like Amarillo, Simcoe, etc that cost a little more. Then there are the hops that you could think of as "featured" hops like Citra and Mosaic that add usually run a little over $20 a pound. There are a lot of new varieties that share a lot of characteristics with more established and familiar hops and sometimes show up on sale.
My last DIPA had 25 ounces of hops (10 gallon batch) that were almost all Centennial, Columbus and Amarillo which I always keep on hand in good quantity and a 4-ounce dose of Mosaic, also on hand but usually used more sparingly because of price, and a 2-ounce packet of Citra Cryo that I just wanted to try out. Total for hops was around $30 when I figure cost per ounce and add in shipping. That's for 10 gallons of beer that was as good as anything you'd get at a bottle shop for 3-4 bucks or more per pint.